Add sync and unsync config for sync task

[wyunchi-ms]

Description

Problem want to solve

We have a pipeline task triggered when tools and other folder is changed in main branch. This task will sync all the files under tools and .azure-pipelines to generation and Azs.tzl branch. But there are some files that target branch don't want to sync.

Solution

Add a new config file: SyncFromMainBranchConfig.json. Path in SyncPath will be synced to target branch. Path in UnSyncPath will not be synced to target branch. Path in UnSyncPath should be child of some path in SyncPath.

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here

[BethanyZhou]

/azp run azure-powershell - windows-powershell

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).