test: built-in bridge system test compatibility

[jarhodes314]

Proposed changes

Verify that all system tests can pass when switching to the built-in bridge by default, however the default bridge type will be set to mosquitto until the built-in bridge stability can be verified.

The CI runner was used to verify that all system tests pass when set to builtin or mosquitto in the system tests (via the bootstrap.sh` script), below are the results:

• Using builtin bridge - PASSED RUN https://github.com/thin-edge/thin-edge.io/actions/runs/10176783954/job/28147947095?pr=2911
• Using mosquitto bridge - (Check the status of this PR to view the test)

Below are the details about the system test changes:

• Support easily switching bridge type (e.g. builtin or mosquitto) in the system test bootstrap.sh script (but default is still using the mosquitto bridge for now)
• Fix system tests which made some assumptions about which bridge was being used

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

• test: Fix remaining test failures from built-in bridge #2879
• Follow up tasks for built-in bridge #2794

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s)
• I ran cargo fmt as mentioned in CODING_GUIDELINES
• I used cargo clippy as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
486	0	2	486	100	1h18m43.215891s

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 78.1%. Comparing base (e419058) to head (86bd3d2).
Report is 51 commits behind head on main.

Files	Patch %	Lines
crates/extensions/tedge_mqtt_bridge/src/lib.rs	25.0%	6 Missing ⚠️

Additional details and impacted files

Files	Coverage Δ
crates/extensions/tedge_mqtt_bridge/src/lib.rs	88.3% <25.0%> (-1.2%)	⬇️

... and 44 files with indirect coverage changes

[reubenmiller]

Approved