Following PR #6284, the Windows Periodic Workflow is prevented from
running on any repository outside of the original.
While this achieves the goal of preventing senseless Windows workflow
failures in contributors' forks, it makes running the workflow for
contributors (even manually) impossible.
This PR adds a separate workflow file which triggers the Windows
Integration workflow iff it is being run off of the original repository,
thus maintaining the upstream scheduling, while allowing contributors to
manually trigger the workflow on their forks if they so desire.
Signed-off-by: Nashwan Azhari <nazhari@cloudbasesolutions.com>
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