Refresh stale archive ID cache when archive rows disappear

[sgiehl]

Summary

This PR fixes a stale-archive-cache issue in Archive::get() that can return empty data from valid reports when cached
archive IDs point to rows that no longer exist.

refs #24191

Problem

Archive caches archive IDs in-memory. If those rows are removed after the cache is populated, later reads in the same
request can still query with stale IDs and return no rows, leading to incorrect zeroed metrics.

Root Cause

Archive::get() trusted cached IDs unconditionally and had no recovery path when ArchiveSelector::getArchiveData()
returned empty for otherwise valid archive queries.

Fix

When archive data comes back empty, Archive::get() now:

1. Clears in-memory archive ID/state cache.
2. Fetches archive IDs/states again.
3. Retries data fetch once.

Tests

Added integration regression tests in tests/PHPUnit/Integration/ArchiveTest.php:

1. testStaleCachedArchiveIdsAreRefreshedWhenArchiveRowsAreMissing
2. testStaleCachedArchiveIdsAreRefreshedAfterArchiveRowsArePurged

The second test reproduces the issue via normal flow (no reflection-based cache overwrite): cache is primed, archive
rows are removed, then the same Archive instance is queried again.

Expected Impact

Prevents false-empty archive reads and incorrect zero metrics when cached archive IDs become stale mid-request.

Checklist

• [✔] I have understood, reviewed, and tested all AI outputs before use
• [✔] All AI instructions respect security, IP, and privacy rules

Review

• Functional review done
• Potential edge cases thought about (behaviour of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• New documentation added or existing documentation updated

[chippison]

Code looks good.

Can't really do manual smoke/functional test for the issue here.
Run integration test and it works. Performed some archiving locally just to make sure everything is still good and everything works fine