Add profile operations usage overview

[yoshifuminakamura]

Summary

Adds a Profile Operations Overview section to the usage report so operators can inspect profile, allocation, trigger, result, and node-hour information together.

Changes

• Add profile usage aggregation from the portal profile DB and received Result JSON files
• Show each profile's allocation project ID, trigger status, latest trigger run, matched results, latest result link, run cause, pipeline ID, and node-hours
• Keep usage totals from double-counting overlapping profile matches
• Update the execution profile handoff docs to reflect that the metadata index is implemented while JSON/tgz artifacts remain the source of truth
• Document the current node-hour accounting convention: cross counts run time, while systems that build and run in one scheduler job are recorded as native

Validation

• .venv/bin/python result_server/tests/run_result_server_tests.py
• .venv/bin/python result_server/tests/check_site_config.py