(#36) Add rule for validating usage of notSilent tag

[AdmiringWorm]

Description Of Changes

This implements a new note rule for CPMR0067 that checks if the tag
notSilent has been used or not.

Motivation and Context

We want to cover as many rules as we can that is currently implemented in Package Validator.

Testing

1. Create a nuspec file.
2. Update the tags element to contain the tag notSilent
3. Run choco pack on the created nuspec file.
4. Verify the rule CPMR0067 is flagged.
5. Repeat previous steps with different letter casing.

Operating Systems Testing

• Windows 10

Change Types Made

• Bug fix (non-breaking change).
• Feature / Enhancement (non-breaking change).
• Breaking change (fix or feature that could cause existing functionality to change).
• Documentation changes.
• PowerShell code changes.

Change Checklist

• Requires a change to the documentation.
• Documentation has been updated.
• Tests to cover my changes, have been added.
• All new and existing tests passed?
• PowerShell code changes: PowerShell v3 compatibility checked?

Related Issue

Fixes #36

[AdmiringWorm]

Ignore the GHA build for now. Instead, check the internal build instead.

EDIT:

PR #56 should be merged before this one

[gep13]

LGTM!