Add Execution Policy setting to Powershell based shell plugins

[herronelou]

Closes #1504

This is a simple implementation of what I was requesting in #1504

I considered a different approach which would have been a bit more generic such as shell_args, which could have included the -NoLogo which is currently being inserted all the time. However, after reviewing the other shell plugins, I couldn't see the case for shell args for all of them, so I kept it localized to only doing exactly what I needed.

[sonarqubecloud]

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0.0% Duplication

[maxnbk]

I rebased to get the CI fixed, but the PR needs DCO fixed (commit signoff)

[maxnbk]

I believe there is only like 5 executionpolicy types that are valid, can we just list only those as valid and check for them / error if not?

[herronelou]

Yes that would be pretty easy to do and prevent injections

[JeanChristopheMorinPerso]

We could add strict values, but why not just use a regex and save us the trouble of having to follow windows/powershell releases/changes?

[herronelou]

I'm fine with either.
The seven PowerShell execution policies are: Default, Restricted, RemoteSigned, AllSigned, Unrestricted, Bypass, and Undefined.
@maxnbk @JeanChristopheMorinPerso you tell me which you prefer and I'll go with it. It doesn't look like policies are updated very frequently, the oldest documentation I can find (powershell 3.0) has the same policies.

[JeanChristopheMorinPerso]

@maxnbk you forgot to add -s when you rebased.

[JeanChristopheMorinPerso]

Hi @herronelou , do you think you could follow the instructions at https://github.com/AcademySoftwareFoundation/rez/pull/1505/checks?check_run_id=16687974501 please? I'd like to merge this but we need commits to be signed off. Thanks!

[JeanChristopheMorinPerso]

Thanks! Hopefully that will be enough for when we enable power shell by default in 3.0.

[herronelou]

@JeanChristopheMorinPerso can you confirm if I fixed it fine?

[JeanChristopheMorinPerso]

Yep, it looks fine. The DCO bot says that everything is properly signed off.

[JeanChristopheMorinPerso]

Thanks @herronelou, this will be released in 3.0.