Preserve WebSession.MaximumRedirection from changes

[CarloToso]

PR Summary

The WebSession.MaximumRedirection parameter shouldn't change as we handle redirections.
This bug appears in edge cases when we use -WebSession -AllowInsecureRedirect -MaximumRedirection together.

Add some tests to check that WebSession doesn't change during usage

PR Context

Fix #19183

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[iSazonov]

@CarloToso I suggest don't modify existing test and add new one - create WebRequestSession $session = [WebRequestSession]::new(), assign properties, iwr -WebSession $session and check that properties are unchanged.

[iSazonov]

@CarloToso Please update the PR title and description.

[iSazonov]

We shouldn't use external server for tests.

[CarloToso]

The same was done in line 2419 with this comment:
# use external url, but with proxy the external url should not actually be called

[iSazonov]

If possible it must be replaced with our helper.

[iSazonov]

Up.

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This PR has 70 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Small
Size       : +66 -4
Percentile : 28%

Total files changed: 2

Change summary by file extension:
.cs : +5 -3
.ps1 : +61 -1

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

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