feat: Add FindNearest API to the stable branch (#1333)

* feat: Support for field update operators in the Datastore API and resolution strategies when there is a conflict at write time

PiperOrigin-RevId: 683253625

Source-Link: https://github.com/googleapis/googleapis/commit/3effbf23b1a1d1fe1306356e94397e20d01d31a0

Source-Link: https://github.com/googleapis/googleapis-gen/commit/5dd983c76417f2ad88f9d47438c48c27d5ac0e27
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* feat: Add FindNearest API to the stable branch

PiperOrigin-RevId: 684905940

Source-Link: https://github.com/googleapis/googleapis/commit/2196d4843a22befdc7bc3b7b676eeb392c31b3cf

Source-Link: https://github.com/googleapis/googleapis-gen/commit/05df6fa16ab93bd9da17b56edd379b43963de167
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: danieljbruce <danieljbruce@users.noreply.github.com>