Add Uid to the error log when reconciling dashboards #2143

[RaviTejaNalluri]

This is the issue that I worked for reviewers reference:#2143

This PR adds the Grafana resource UID to reconciliation error logs to improve troubleshooting in environments with multiple dashboards/datasources.

Changes Made:

Path: controllers/dashboard_controller.go:

• Added uid to plugin error logs.
• Prefixed applyErrors and applyHomeErrors with uid.
• Included uid in the final aggregated “failed to apply to all instances” error.

Path: controllers/datasource_controller.go:

• Compute uid via cr.CustomUIDOrUID().
• Added uid to plugin error logs.
• Prefixed applyErrors with uid.
• Included uid in the final aggregated “failed to apply to all instances” error.

Testing: make all (lint/build/tests) passed locally.

Thank you. Do let me know if I need to change else where or if I need to make any other improvements.

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