Updated pipeline files to support change of master to main - Fixes #469

[PlagueHO]

Pull Request (PR) description

This PR updates the files to support the rename of master branch to main branch.

This Pull Request (PR) fixes the following issues

• FIxes Rename master branch to main #469

Task list

• Added an entry under the Unreleased section of the change log in the CHANGELOG.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in README.md in resource folder.
• Resource parameter descriptions added/updated in schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• x ] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

@johlju - would you mind reviewing for me when you have time?

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This change is 

[johlju]

Reviewed 62 of 62 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @PlagueHO)