Fix redirection for -CustomMethod "POST" in WebCmdlets

[CarloToso]

PR Summary

• If we get to this point with -CustomMethod "POST", we don't use IsRedirectToGet because we only check for Method == WebRequestMethod.Post
  --> checking for req.Method == HttpMethod.Post solves this but:

• setting Method = WebRequestMethod.Get would be ignored by HttpMethod httpMethod = string.IsNullOrEmpty(CustomMethod) ? GetHttpMethod(Method) : new HttpMethod(CustomMethod) (in GetResponse line 1230)
  --> solved by setting CustomMethod = string.Empty

PR Context

Fix bug discussed in #18894 @iSazonov, merge before #18894

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[iSazonov]

LGTM.

Could you please check that new tests don't work with 7.3?

[CarloToso]

@iSazonov I confirm the new test fails in PS7.3.2

[iSazonov]

@CarloToso Please resolve merge conflict.

[CarloToso]

Resolved merge conflict

[CarloToso]

Unrelated error

[pull-request-quantifier-deprecated]

This PR has 50 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Extra Small
Size       : +40 -10
Percentile : 20%

Total files changed: 2

Change summary by file extension:
.cs : +8 -7
.ps1 : +32 -3

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🎉v7.4.0-preview.2 has been released which incorporates this pull request.:tada:

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