Remove time-based condition for Pull mirroring

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",

added backend groupsource code maintenanceremoval typefeature labels

marked this issue as related to #216783 (closed)

added to epic &8225

mentioned in issue #216783 (closed)

Setting label(s) Category:Source Code Management devopscreate sectiondev based on groupsource code.

added Category:Source Code Management devopscreate sectiondev labels

changed milestone to %15.5

set weight to 2

added backend-weight2 label

added [deprecated] Accepting merge requests label

added workflowready for development label

mentioned in issue gitlab-org/quality/triage-reports#9122 (closed)

mentioned in epic &6592 (closed)

Moved to %Backlog

changed milestone to %Backlog

added maintenancerefactor label

added typemaintenance label and removed maintenanceremoval typefeature labels

added quad-planningcomplete-no-action label

added mirroring label