[tests-only] removing the setresponse in given/when/then step in webdavproperties context (#7368)

* refactor given and when steps in webdavproperties context

* change the status code in tests as the when step sets the response now

* correct the status code check

* only save response

* use getResponseXml to get xml response object

* fix isEtagValid method

* rename step def methods

* make stricter checks

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Co-authored-by: Saw-jan <saw.jan.grg3e@gmail.com>
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