fix datetime in eager workflow

[novahow]

Tracking issue

Why are the changes needed?

[3/3] currentAttempt done. Last Error: SYSTEM::Traceback (most recent call last):
  File "/flytekit/flytekit/bin/entrypoint.py", line 103, in _dispatch_execute
    outputs = asyncio.run(outputs)
  File "/usr/local/lib/python3.10/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/local/lib/python3.10/asyncio/base_events.py", line 649, in run_until_complete
    return future.result()
  File "/flytekit/flytekit/core/base_task.py", line 666, in _async_execute
    native_outputs = await native_outputs
  File "/flytekit/flytekit/experimental/eager_function.py", line 517, in wrapper
    out = await _fn(*args, **kws)
  File "/root/test_async.py", line 68, in simple_async_workflow
    res = await coro
  File "/flytekit/flytekit/experimental/eager_function.py", line 184, in __call__
    while datetime.now(timezone.utc) < time_to_give_up:
TypeError: can't compare offset-naive and offset-aware datetimes

datetime comparison is wrong when using eager_workflows

What changes were proposed in this pull request?

changed datetime.max as timezone-aware datetime and prevented timestamp overflow by subtracting 2 days.

How was this patch tested?

pytest --pdb -x tests/flytekit/unit/experimental/test_eager_workflows.py -s

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.55%. Comparing base (2719b34) to head (298d798).
Report is 14 commits behind head on master.

Files	Patch %	Lines
flytekit/experimental/eager_function.py	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (2719b34) and HEAD (298d798). Click for more details.

HEAD has 13 uploads less than BASE

Flag	BASE (2719b34)	HEAD (298d798)
	15	2

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2541      +/-   ##
==========================================
- Coverage   77.65%   72.55%   -5.10%     
==========================================
  Files         236      183      -53     
  Lines       20789    18726    -2063     
  Branches     3661     3695      +34     
==========================================
- Hits        16144    13587    -2557     
- Misses       4017     4487     +470     
- Partials      628      652      +24     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.