editoast: provide PgAuthDriver a connection instead of the pool #12037

Job	Run time
check_railjson_generator	1m 57s
check_generated_railjson_sync	25s
check_commits	9s
build (core-build, core)	15s
build (editoast, editoast-test)	26s
build (gateway-test, gateway-standalone, gateway-front)	2m 7s
check_infra_schema_sync	18s
check_integration_tests	1m 20s
build (front-build, front-tests, front-devel, front-nginx)	16s
build (osrdyne, osrdyne-test)	24s
check_osrd_schema	38s
check_reuse_compliance	11s
check_toml	4s
Check final newline	17s
check_core	4m 3s
check_editoast_tests	4m 15s
check_editoast_openapi	1m 24s
check_editoast_lints	4m 58s
check_front	3m 1s
check_front_rtk_sync	1m 49s
check_gateway	2m 1s
integration_tests	8m 7s
check_osrdyne	2m 43s
	41m 8s

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