Allow linking upstream accounts for existing users when the localpart matches in upstream OAuth 2.0 logins #3638

Job	Run time
Run the frontend test suite	32s
Lint and test OPA policies	10s
Check frontend style	30s
Check the frontend for unused dependencies	26s
Compile test artifacts	3m 48s
Check Rust style	16s
Run `cargo deny` checks	39s
Check schema	3m 45s
Run Clippy	2m 27s
Run test suite with Rust stable (2)	2m 8s
Run test suite with Rust stable (1)	2m 13s
Run test suite with Rust stable (3)	2m 29s
Tests done	3s
	19m 26s

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