Add Get-ChildItem test

[iSazonov]

PR Summary

Add new test for #3724 to exclude a regression.

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[iSazonov]

/cc @mklement0 for information.

[mklement0]

I suggest adding another test where escaped and [ and ] are combined with * or ? - because a bug currently lurks there (you inexplicably need an extra round of escaping then); e.g., Get-Item -Path 'a```[b*' breaks at the moment.

[iSazonov]

@mklement0 Thanks!

Done.

@adityapatwardhan I don't use -Casesso as not to add a new Describe.

[iSazonov]

I removed the test because it seems it looks like a bug. I hope we will discuss this in new issue.

[mklement0]

@iSazonov: We have a catch-all issue at #7999 and one regarding invalid patterns getting ignored #6733. Perhaps put the tests in commented out for now, with a link to the issues?

Also note that ] doesn't need escaping, as long as the [ is escaped; so, given that Get-ChildItem -Path 'a```[b`]' works, but Get-ChildItem -Path 'a```[b]' (no escaping of ]) doesn't, that should be considered another bug.

[iSazonov]

Perhaps put the tests in commented out for now, with a link to the issues?

We could add tests in pending state but I think it will be more useful if it is in related discussions than hidden in tests.

[ghost]

🎉v7.0.0-preview.5 has been released which incorporates this pull request.:tada:

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