[incident-52391] Split dd-sts policies to only request an app key when needed

[KSerrania]

What does this PR do?

Follow-up of #7924. Only request an app key when needed (i.e. only in project.yaml). See policy definition in https://github.com/DataDog/dd-source/pull/404122.

Motivation

Fix CI.

Additional Notes

n/a

[github-actions]

Overall package size

Self size: 5.48 MB
Deduped: 6.33 MB
No deduping: 6.33 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.0.0 | 81.15 kB | 815.98 kB | | dc-polyfill | 0.1.10 | 26.73 kB | 26.73 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[datadog-datadog-prod-us1-2]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 49.84% (-15.33%)

_{This comment will be updated automatically if new data arrives.
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The CI is still failing across the board