PowerPlatform integration

[freddydk]

Fixes #361

New Settings:

• PowerPlatformSolutionFolder - containing the name of the folder containing a PowerPlatform Solution (only one)
• companyId and ppEnvironmentUrl added to deploymentSettings for environments.

New Actions:

• BuildPowerPlatform - to build a PowerPlatform Solution
• DeployPowerPlatform - to deploy a PowerPlatform Solution
• PullPowerPlatformChanges - to pull changes made in PowerPlatform studio into the repository
• ReadPowerPlatformSettings - to read settings and secrets for PowerPlatform deployment
• GetArtifactsForDeployment - originally code from deploy.ps1 to retrieve artifacts for releases or builds - now as an action to read apps into a folder.

New Workflows:

• Pull PowerPlatform Changes
• Push PowerPlatform Changes

Other changes

• Getting artifacts for deployment moved from deploy.ps1 to a seperate action
• Test for specific version of containerhelper moved to avoid many warnings
• Add scenarios for PowerPlatform
• Add PowerPlatformSolution artifact to builds
• Add unpack parameter to DownloadArtifact to unpack after download.

TO:DO

• Fix failing CI tests
• Ensure End 2 End test are passing
• Increment version number in PowerPlatform project (awaits Increment Version Number PR from @mazhelez)
• Unit Tests
• End 2 End test
• Remove PREVIEW prefix from various docs
• Remove usage of private version of BcContainerHelper
• Release notes
• Document new settings

[mazhelez]

Looks alright.

The checks for some jobs seem unnecessarily complex now, can you double check if all the checks are needed?

[freddydk]

Had some last fixes due to end 2 end tests failing - passes now.
Pls approve and I will merge and deploy to preview