tests

[BUG][MySQL] `IsolationLevel` not respected in some cases #4520

Job	Run time
Clippy	1m 29s
Init	8s
Rustfmt	17s
Examples (examples/actix_example)	2m 28s
Unit Test	3m 18s
Examples (examples/axum_example)	2m 37s
Examples (examples/basic)	1m 16s
Examples (examples/graphql_example)	2m 44s
Examples (examples/jsonrpsee_example)	2m 36s
Examples (examples/loco_example)	2m 54s
Examples (examples/loco_starter)	3m 2s
Examples (examples/loco_seaography)	4m 0s
Examples (examples/poem_example)	2m 28s
Examples (examples/proxy_gluesql_example)	1m 24s
Examples (examples/react_admin)	3m 59s
Examples (examples/rocket_example)	3m 8s
Examples (examples/rocket_okapi_example)	3m 14s
Examples (examples/salvo_example)	2m 59s
Examples (examples/seaography_example)	2m 37s
Examples (examples/tonic_example)	2m 39s
Compile SQLite (async-std, native-tls)	3m 0s
Compile PostgreSQL (tokio, native-tls)	3m 14s
Compile SQLite (async-std, rustls)	2m 56s
CLI	0s
Compile PostgreSQL (tokio, rustls)	3m 16s
Compile MySQL (actix, native-tls)	2m 57s
Compile MySQL (actix, rustls)	2m 59s
Issues Matrix	0s
Issues	0s
MariaDB (lts, actix, native-tls)	2m 23s
MySQL (lts, actix, native-tls)	3m 35s
MySQL (5.7, actix, native-tls)	3m 35s
Postgres (14, tokio, native-tls)	6m 42s
Postgres (16, tokio, native-tls)	6m 45s
SQLite (async-std, native-tls)	4m 40s
SQLite (async-std, rustls)	4m 30s
	1h 39m 49s

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