Update LightningCLI test for new support in latest release of jsonargparse

[mauvilsa]

What does this PR do?

With the latest release of jsonargparse, signature parameters can now be resolved from kwargs.get() statements (see profilers/pytorch.py#L289). This makes test_pytorch_profiler_init_args fail, so this pull request updates the test to avoid failures.

Also some comments were added to better understand what is being tested in parameter resolving. And the minimum jsonargparse version was bumped because anyway it is needed to resolve #13689 (comment).

Does your PR introduce any breaking changes? If yes, please list them.

None

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[codecov]

Codecov Report

Merging #13805 (9479a0f) into master (81f149e) will decrease coverage by 9%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #13805     +/-   ##
=========================================
- Coverage      86%      76%     -9%     
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  Files         328      328             
  Lines       25600    25600             
=========================================
- Hits        21933    19559   -2374     
- Misses       3667     6041   +2374