"CI Outer-Loop Failure Scanner" should not run in forks

[vcsjones]

Most of the actions that run on a cron schedule are disabled for forks

runtime/.github/workflows/labeler-cache-retention.yml

Lines 28 to 29 in da574bb

	# Do not automatically run the workflow on forks outside the 'dotnet' org
	if: ${{ github.event_name == 'workflow_dispatch' || github.repository_owner == 'dotnet' }}

This does not seem to be true for the "CI Outer-Loop Failure Scanner", and it is running on a cron schedule in forks, if the fork has actions turned on.

runtime/.github/workflows/ci-failure-scan.md

Line 11 in da574bb

schedule: every 12h

[vcsjones]

@kotlarmilos do you have any thoughts on this?

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