Fix YAML and PowerShell linter warnings

[schrolla]

🗣 Description

The updates in this PR resolve several warnings from existing linting checks which includes:

• Adding a PSScriptAnalyzer configuration file to suppress some warnings during checks
• Updating the PowerShell linter workflow to use the new configuration settings
• Resolving YAML trailing whitespace and indentation warnings
• Fixes path to Pester tests for markdown checks workflow

💭 Motivation and context

This change resolves automated testing check failures. Resolving the issue ensures a clean passing baseline for the current development branch.

Closes #808

🧪 Testing

Since these updates affect the automated checks. Testing is done by reviewing the Lint Check for YAML and Lint Check for PowerShell check results. Also added changes to fix silent fail of 'Markdown Check' workflow. Results should be green and show that all configured tests were run successfully.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• All new and existing tests pass.

✅ Pre-merge checklist

• Rebase against parent branch if necessary

✅ Post-merge checklist

• Ensure that automated checks on parent branch pass after the merge

[james-garriss]

These changes all look good to me.

[nanda-katikaneni]

Look good to me.