PIR: Add initial scan restart on PIR dashboard launch

[landomen]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1203581873609357/task/1215725818623013?focus=true
Tech Design URL (if applicable): https://app.asana.com/1/137249556945/project/1203581873609357/task/1213368145276564?focus=true

Description

• Triggers the foreground scan when PIR dashboard is opened and there are incomplete jobs.
• Handles coordination between foreground service and scheduled worker to now cancel each other
• TODO: pixel updates - next PR

Steps to test this PR

See https://app.asana.com/1/137249556945/project/1203581873609357/task/1215930117038075?focus=true

UI changes

No UI changes

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Note

Medium Risk
Changes scan scheduling and foreground/background coordination; mis-guarding could duplicate scans or leave interrupted initial scans unfinished, though toggles and explicit skip paths limit blast radius.

Overview
When the PIR dashboard loads and detects an interrupted initial scan (pending NOT_EXECUTED jobs, nothing running), it can now restart the foreground scan instead of only logging a pixel. Behavior is gated by a new remote toggle resumeInitialScanOnDashboardOpen (default on).

Resume path: On the first INITIAL_SCAN_STATUS message per dashboard activity, if resume is warranted, the handler still emits reportInitialScanIncomplete, then calls PirForegroundScanServiceStarter.startResumeScan() with MANUAL_INITIAL so only remaining brokers run.

Coordination: Resume is suppressed when a foreground scan or the periodic scheduled scan worker is already running. The scheduled worker skips its run (success, no jobs) if the foreground service is active—avoiding overlapping scan execution. Running-state checks move behind injectable PirForegroundScanServiceMonitor and PirScanScheduler.isScheduledScanRunning() for testability.

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[landomen]

• PIR: Add initial scan restart on PIR dashboard launch #8959 👈 (View in Graphite)
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