jobrunaggregator: add numerical identifiers to job run squares

[petr-muller]

Summary

Add stable numerical identifiers (1, 2, 3, ...) to the colored squares in the Spyglass Suite Information HTML artifact. This makes it easy to identify correlations between test failures across different tests.

Changes

• Add helper functions to collect and number all unique JobRunIDs from the test suite
• Display numbers on colored squares (red for failures, purple for flakes, green for passes)
• Numbers are sorted alphabetically by JobRunID for stable, deterministic ordering
• Same JobRunID shows the same number across all tests in the report
• Add dict template function to pass multiple values to nested templates

Example

If three tests fail in job run 1234567890, all three will display the same number (e.g., "1") on their red squares, making the correlation immediately visible.

Test plan

• [x] Code compiles successfully
• [x] All tests pass
• [ ] Run job-run-aggregator on actual aggregation job
• [ ] Verify numbers appear on squares
• [ ] Verify same JobRunID shows same number across different tests
• [ ] Check visual appearance and readability

🤖 Generated with Claude Code

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: petr-muller

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[petr-muller]

Pure Claude work, I'd like to test this first