feat: Add custom OAuth setting to allow merging users to others from distinct services (#28783)

* Merge OAuth users with existing users from distinct services when setting is enabled

* Add changesets

* Fix changesets

* Apply requested changes

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Co-authored-by: Diego Sampaio <chinello@gmail.com>
Co-authored-by: Rafael Tapia <rafael.tapia@rocket.chat>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
Co-authored-by: Gabriel Casals <83978645+casalsgh@users.noreply.github.com>