docs: add platform test improvement proposal documentation

[IvanKavaldzhiev]

Description:
This PR adds a documentation, which proposes improvements in the platform testing frameworks.

Related issue(s):

Fixes #17705

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.01%. Comparing base (dff9142) to head (386826f).

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #17728   +/-   ##
=========================================
  Coverage     69.01%   69.01%           
  Complexity    23009    23009           
=========================================
  Files          2647     2647           
  Lines         99465    99465           
  Branches      10289    10289           
=========================================
  Hits          68641    68641           
  Misses        26940    26940           
  Partials       3884     3884           

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (dff9142)	99248	72374	72.92%
Head commit (386826f)	99248 (+0)	72374 (+0)	72.92% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#17728)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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