fix(adapter-pg): prepend + to expanded years in timestamps to prevent invalid date

[AbhilashG12]

Linked issue

Fixes #30151

Summary

In @prisma/adapter-pg, timestamps with expanded years (more than 4 digits) were being silently deserialized into Invalid Date objects (getTime() === NaN).

This occurs because ECMAScript's Date.parse strictly enforces the ISO 8601 standard, which requires expanded years (>9999) to carry an explicit sign (+ or -). Postgres outputs dates like 202609-02-05 05:00:00, and normalize_timestamp was not appending the mandatory +, causing V8 to reject it.

This PR updates both normalize_timestamp and normalize_timestamptz to perform a fast regex check (/^\d{5,}/.test()). If the normalized string starts with 5 or more digits, it prepends the mandatory + sign. This resolves downstream RangeError: Invalid time value crashes.

Testing performed

• Added unit tests to conversion.test.ts to verify 4-digit and >4-digit boundaries for both timezone-aware and timezone-naive timestamps.
• pnpm --filter @prisma/adapter-pg test

Skill update

n/a — internal only

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