ci: reduce pytest feedback time

[level09]

Description

Reduces pytest feedback time by splitting the suite into three isolated GitHub Actions jobs. Keeps ExifTool because pyexifinfo requires it during installation, while removing GDAL and FFmpeg from this pytest workflow. Also adds uv caching, locked dependency sync, slow-test reporting, and cancellation of obsolete runs.

A final job remains named pytest, so the existing required check is preserved and reports failure if any shard fails.

Measurements

• Baseline: 3 minutes 11 seconds
• Setup-only optimization: 2 minutes 43 seconds
• Final cold-cache run: 2 minutes 7 seconds
• Final warm-cache run: 1 minute 55 seconds
• Warm-cache reduction: 1 minute 16 seconds, about 40%

The trade-off is higher total runner usage because PostgreSQL, Redis, and setup run three times. This optimizes feedback latency, not billed runner minutes.

How to Test

• 284 tests collected in specialized
• 292 tests collected in lookups-users
• 314 tests collected in remaining
• Final result: 886 passed and 4 skipped
• All shard checks, the required pytest summary, CodeQL, Semgrep, pip-audit, and retire-js passed

Jira ID

Not applicable

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