[QA] review all TODOs in test code

[nirajacharya2]

There are few TODOs in our test code instead of commenting on the code a issue should be created for it.

• TrashbinContext.php @S-Panta [tests-only]removed to do comment inside Trashbin #10424
• behat.yml [tests-only][full-ci]removed to do comment-in-behat-config #10434
• WebDav.php [QA] cleanup to-do in WebDav.php test code #10435 [tests-only][full-ci] updated feature file to remove trailing slash for folder propfind request #10436
• WebDavHelper.php [QA] Remove old dav path for public link share #10529 [tests-only][full-ci]remove old dav path for public share #10535
• searchFederationUsers.feature -> Tracked in:Extend test coverage for ocm #10073

[S-Panta]

Closing this issue as ocm related issue is tracked by #10073