[Grid] Add delete files method

[aldobrynin]

Implement delete files method: DELETE /session/{sessionId}/se/files

Fixes #11986

Description

Implemented method to delete all files in current session's downloads directory

Motivation and Context

Sometimes it is required to cleanup downloads directory. For example, in order to use pooled session developers need to be able to reset session state before next test run. Downloads directory is of the session features that one might want to cleanup during session lifecycle

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• [] My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[CLAassistant]

All committers have signed the CLA.

[karanjeetbirdeye]

If a file is downloaded and gets deleted from session, when the next downloaded file is present in session, it would give us only 1 file (last downloaded file) or all of them?

[aldobrynin]

If a file is downloaded and gets deleted from session, when the next downloaded file is present in session, it would give us only 1 file (last downloaded file) or all of them?

it would give us only 1 file

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (49e8d43) 57.26% compared to head (f89e402) 57.26%.
Report is 3 commits behind head on trunk.

❗ Current head f89e402 differs from pull request most recent head 681cc67. Consider uploading reports for the commit 681cc67 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #12501   +/-   ##
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  Coverage   57.26%   57.26%           
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  Files          86       86           
  Lines        5335     5335           
  Branches      198      198           
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  Hits         3055     3055           
  Misses       2082     2082           
  Partials      198      198           

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[krmahadevan]

@diemol - I have gone through the changes and they look good to me.

[diemol]

Thank you, @aldobrynin!

Thank you for reviewing, @krmahadevan!