Harden some problematic release tests.

[JamesWTruher]

Ignore failure to remove module in AfterAll.
Handle the case where get-volume does not return a volume. Add missing back-quote to test checking whether psmodulepath is obscured appropriately.

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[adityapatwardhan]

Was this one missed?

[JamesWTruher]

yep
pushed a fix

[pull-request-quantifier-deprecated]

This PR has 112 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      : Medium
Size       : +74 -38
Percentile : 42.4%

Total files changed: 5

Change summary by file extension:
.ps1 : +74 -38

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

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