fix #3990: query metric history by monitor ID instead of instance

[yykaue]

What's changed?

Fixes #3990.

• Pass monitorId from the metric history chart to the backend API.
• Query VictoriaMetrics history data using the __monitor_id__ label instead of instance.
• Apply the fix to both single-node and cluster VictoriaMetrics storage.
• Support both regular and interval metric history queries.
• Preserve the existing instance-based behavior when monitorId is not provided or unsupported by the storage backend.
• Add regression tests for the controller, service, frontend request, and VictoriaMetrics queries.

Testing

• Backend targeted tests: 19 passed, 0 failures.
• Frontend targeted tests: 2 passed, 0 failures.
• Maven Checkstyle: passed with 0 violations.
• Frontend ESLint: passed.

Checklist

• I have read the Contributing Guide.
• I have written the necessary doc or comment.
• I have added the necessary unit tests and all cases have passed.