lib/uktest: Introduce FIX ME assertion in uktest

[YuanSamuel]

Prerequisite checklist

• Read the contribution guidelines regarding submitting new changes to the project;
• Tested your changes against relevant architectures and platforms;
• Ran the checkpatch.uk on your commit series before opening this PR;
• Updated relevant documentation.

Base target

• Architecture(s): N/A
• Platform(s): N/A
• Application(s): N/A

Additional configuration

• CONFIG_LIBUKTEST_STRICT_MODE=y

Description of changes

This PR attempts to address #1027 , which introduces a new FIX ME assertion to downgrade known failing tests. Tests marked as FIX_ME will show up as OMITTED in the testing logs, and will be counted toward the overall failure count only if the strict mode config is turned on.

An example output log is below:

GitHub-Closes: #1027

[YuanSamuel]

Hey team!

As mentioned in #1027 , I've made some initial changes in order to support the FIX_ME test downgrades.

These are just some initial changes, please feel free to leave any feedback before I add support for more tests.

Thanks!

[YuanSamuel]

Hey all, I've gone ahead and integrated the rest of appropriate FIX ME downgrades for tests. Please feel free to leave any more feedback!

[nderjung]

Thanks so much for tackling this and apologies for the delay in getting back to you!

On my side I still need to test this properly and will get back to you soon with the status of my tests.

I have one inline comment, but additionally, the FIXME macro should be ansi-coloured into yellow (similar to pass/fail).

[nderjung]

To keep things consistent internally, lets ensure FIXME is a single word, i.e.:

- 	bool "Count failing FIX_ME tests"
+ 	bool "Count failing FIXME tests"

Please ensure all other instances of "FIX ME" and "FIX_ME" (including commits) are adjusted to "FIXME".

I think the only exception should be the visual message displayed in the console log.

[razvand]

@YuanSamuel , could you please update this PR to include the feedback from @nderjung ?