make acceptance tests for webdav locking issues that are not catched by litmus

[individual-it]

webdav locking is tested by litmus, but it seems not to catch all possible problems. See e.g.:
overall test plan: #34157

• Parent share link path leaked through lock info #34225 Fix public link path for persistent locks #34229
• Propagate persistent lock to federated instance #34222 - nothing to test yet because functionality is not implemented
• Persistent lock on folder still allows to create files but not overwrite #33848
  we want to have a set of tests that check this issues

[ownclouders]

GitMate.io thinks the contributor most likely able to help you is @phil-davis.

Possibly related issues are #5122 ([webdav] litmus test LOCK is broken), #33690 (cleanup acceptance tests WebDav trait), #21767 (issue), #32769 (Make targets for acceptance tests), and #33888 (Add tests for lock leak issue).

[individual-it]

fixed by #34257 and commits to #34229