Add container to Linux CI

[TravisEz13]

PR Summary

Add a test in a container to allow broader distribution testing in CI:

1. Add a mechanism to query and select an image from the docker repo, currently hard coded to select mariner.
2. add a new template which supports running tests in a container
   • Steps were moved to a new template so that the templates share as much as possible.
3. fix tests so they pass on mariner

PR Context

PR Checklist

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• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
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• Breaking changes
  • None
  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s):
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed:
• Testing - New and feature
  • N/A or can only be tested interactively
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  • Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
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      (which runs in a different PS Host).
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[PaulHigin]

LGTM

[TravisEz13]

/azp run PowerShell-CI-windows

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[pull-request-quantifier-deprecated]

This PR has 307 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      : Large
Size       : +183 -124
Percentile : 70.7%

Total files changed: 11

Change summary by file extension:
.yml : +146 -75
.ps1 : +10 -41
.psd1 : +1 -0
.psm1 : +26 -8

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

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[ghost]

🎉v7.3.0-preview.4 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes

[TravisEz13]

We should only backport the wsman test fixes to 7.2