Update plugin-check to 1.6 and reuse PHPCS ruleset

[westonruter]

This is a follow up to #2048.

This PR is made possible by WordPress/plugin-check#966.

[github-actions]

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Co-authored-by: westonruter <[email protected]>
Co-authored-by: mukeshpanchal27 <[email protected]>

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[mukeshpanchal27]

PHP Lint shows error because In WordPress/plugin-check#994 they removed the below sniff checks that we have to remove from tools/phpcs/phpcs.ruleset.xml.

• Removes PluginCheck.CodeAnalysis.ImageFunctions
• Removes Checks\Performance\Image_Functions_Check

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.18%. Comparing base (e147007) to head (42c9054).
⚠️ Report is 4 commits behind head on trunk.

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk    #2099   +/-   ##
=======================================
  Coverage   67.18%   67.18%           
=======================================
  Files          93       93           
  Lines        7750     7750           
=======================================
  Hits         5207     5207           
  Misses       2543     2543           

Flag	Coverage Δ
multisite	67.18% <ø> (ø)
single	36.61% <ø> (ø)

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