Fix cachekey in incremental

[sgalcheung]

Changes

• What does this change?

• Add UT restore issue.

• Improve cache key handling with a hashing function

• This doc must be updated if you accept my PR.

Testing

Run node test command:

node ./packages/astro/test/get-static-paths-incremental.test.ts 

Closed issue: #17635

[changeset-bot]

⚠️ No Changeset found

Latest commit: ef0160e

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[codspeed-hq]

Merging this PR will not alter performance

✅ 21 untouched benchmarks

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_{Comparing sgalcheung:fix-cachekey-in-incremental (ef0160e) with main (bd2c1a5)¹}

Footnotes

1. No successful run was found on main (7c4bf1b) during the generation of this report, so bd2c1a5 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩