AX-2134: replace release-please with version-file diff

[YoniMelki]

Summary

• Replace release-please + Conventional Commits with a version-file trigger: package.json vs the latest vX.Y.Z tag on push to main.
• Remove release-please-config.json, .release-please-manifest.json, and pr-title.yml.
• Keep npm trusted publishing: successful releases still dispatch publish-as-is.yml.

Part of AX-2134.

Test plan

• Confirm pr-title.yml and release-please files are gone.
• Confirm release.yml fails loudly when package.json version equals or is older than the latest tag.
• Confirm a newer version creates a GitHub Release and dispatches publish-package-as-is.
• After merge, verify a real (even patch) release still publishes via OIDC trusted publishing.

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