build: added syncignore to skip the specific paths in the private mirror (e.g. sensitive data or tests)

[RinatS]

Pull Request

build: added syncingore to skip the specific paths in the private mirror (e.g. sensitive data or tests)

Proposed Changes

N/A

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request
• run npm run lint and fix any linting issues that have been introduced
• run npm run test and run tests
• If publishing new data to the public (scorecards, security scan results, code quality results, live dashboards, etc.), please request review from @jeffrey-luszcz

Reviewer

• [ enhancement]