fix physical channel/device collection slice/string behavior

[zhindes]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

Fixes string and slice behavior of Physical Channel Collection to match that of Device Collection

• slices return a list
• strings are unflattened and return a list if more than 1 channel is provided

New behavior

• For both Physical Channel and Device - raise KeyError if a string is provided that doesn't match the collection
• Decided against this as we can't validate internal channel names, yet. Keep existing behavior.

Why should this Pull Request be merged?

Closes #392

What testing has been done?

Added new tests. Fixed existing tests that used the name of an invalid PhysicalChannel object to use the channel_names property of the collection instead.

poetry run ni-python-styleguide fix tests && poetry run ni-python-styleguide lint tests && poetry run pytest -rs -k collection
================================================= test session starts =================================================
platform win32 -- Python 3.9.13, pytest-8.0.2, pluggy-1.4.0
rootdir: C:\dev\nidaqmx-python
configfile: pyproject.toml
testpaths: tests
plugins: cov-4.1.0, mock-3.12.0
collected 2163 items / 1721 deselected / 442 selected

tests\component\system\_collections\test_device_collection.py ....................                               [  4%]
tests\component\system\_collections\test_persisted_channel_collection.py ....................                    [  9%]
tests\component\system\_collections\test_persisted_scale_collection.py ....................                      [ 13%]
tests\component\system\_collections\test_persisted_task_collection.py ....................                       [ 18%]
tests\component\system\_collections\test_physical_channel_collection.py ........................................ [ 27%]
................................................................................................................ [ 52%]
................................................................................................................ [ 77%]
........................................................................................                         [ 97%]
tests\legacy\test_system_collections.py ..........                                                               [100%]

======================================== 442 passed, 1721 deselected in 11.99s ========================================

[github-actions]

Test Results

    34 files  ±    0      34 suites  ±0   43m 15s ⏱️ + 1m 8s
 2 228 tests +  160   1 893 ✅ +  192    335 💤  -  32  0 ❌ ±0 
39 392 runs  +2 720  33 866 ✅ +3 264  5 526 💤  - 544  0 ❌ ±0 

Results for commit a9a8a79. ± Comparison against base commit 2e0e590.

This pull request removes 32 and adds 192 tests. Note that renamed tests count towards both.

tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_str___shared_interpreter[grpc_init_kwargs-ai_physical_chans]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_str___shared_interpreter[grpc_init_kwargs-ao_physical_chans]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_str___shared_interpreter[grpc_init_kwargs-ci_physical_chans]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_str___shared_interpreter[grpc_init_kwargs-co_physical_chans]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_str___shared_interpreter[grpc_init_kwargs-di_lines]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_str___shared_interpreter[grpc_init_kwargs-di_ports]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_str___shared_interpreter[grpc_init_kwargs-do_lines]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_str___shared_interpreter[grpc_init_kwargs-do_ports]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_str___shared_interpreter[library_init_kwargs-ai_physical_chans]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_str___shared_interpreter[library_init_kwargs-ao_physical_chans]
…

tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_mixed_str_list___name[grpc_init_kwargs-ai_physical_chans]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_mixed_str_list___name[grpc_init_kwargs-ao_physical_chans]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_mixed_str_list___name[grpc_init_kwargs-ci_physical_chans]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_mixed_str_list___name[grpc_init_kwargs-co_physical_chans]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_mixed_str_list___name[grpc_init_kwargs-di_lines]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_mixed_str_list___name[grpc_init_kwargs-di_ports]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_mixed_str_list___name[grpc_init_kwargs-do_lines]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_mixed_str_list___name[grpc_init_kwargs-do_ports]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_mixed_str_list___name[library_init_kwargs-ai_physical_chans]
tests.component.system._collections.test_physical_channel_collection ‑ test___physical_channels___getitem_mixed_str_list___name[library_init_kwargs-ao_physical_chans]
…

♻️ This comment has been updated with latest results.

[bkeryan]

Approved with suggestions