Remove time-based condition for Pull mirroring

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Follow-up for #216783 (closed)

Problem

In Pull Mirroring code we have a time-based condition. We stopped offering pull mirroring for private projects. With the new deactivation logic for ineligible project mirrors this condition won't be necessary.

Solution

• Find how many projects are excluded from the query by this condition
• Remove the condition and mark these projects as hard-failed

   retry_count: 15,
   status: "failed",
   last_error: "Project mirroring is not supported",