[Backport 2.x] [Tests] Skip tests inside the docs folder

[opensearch-trigger-bot]

Backport 1d4bbe7 from #3197.

[codecov-commenter]

Codecov Report

Merging #3200 (a82848e) into 2.x (99353ea) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              2.x    #3200      +/-   ##
==========================================
- Coverage   66.66%   66.60%   -0.07%     
==========================================
  Files        3219     3219              
  Lines       61531    61531              
  Branches     9431     9431              
==========================================
- Hits        41018    40980      -38     
- Misses      18275    18307      +32     
- Partials     2238     2244       +6     

Flag	Coverage Δ
Linux	66.60% <ø> (-0.01%)	⬇️
Windows	?

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Impacted Files	Coverage Δ
src/dev/build/lib/get_build_number.ts	57.14% <0.00%> (-42.86%)	⬇️
src/setup_node_env/harden/child_process.js	38.46% <0.00%> (-38.47%)	⬇️
packages/osd-cross-platform/src/path.ts	51.21% <0.00%> (-34.15%)	⬇️
...ges/osd-apm-config-loader/src/config.test.mocks.ts	91.30% <0.00%> (-8.70%)	⬇️
src/dev/build/lib/config.ts	79.41% <0.00%> (-5.89%)	⬇️
...s/osd-optimizer/src/node/node_auto_tranpilation.ts	83.67% <0.00%> (-4.09%)	⬇️
packages/osd-optimizer/src/node/cache.ts	50.00% <0.00%> (-3.95%)	⬇️
...ared/static/forms/hook_form_lib/hooks/use_field.ts	65.70% <0.00%> (-0.97%)	⬇️

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