chore: Add full-fledged mysql test source #4036

Job	Run time
Collect suggests deps	30s
Smoke test: stock R	9m 14s
Check deps	0s
pkgdown	8m 57s
windows-latest (release)	15m 50s
macos-latest (release)	14m 8s
ubuntu-22.04 (release)	8m 59s
ubuntu-20.04 (release)	13m 5s
Without colourpicker	5m 24s
ubuntu-22.04 (devel)	12m 55s
Without covr	6m 6s
ubuntu-22.04 (release) with covr	13m 37s
Without DBI	4m 17s
ubuntu-22.04 (oldrel-1)	8m 58s
Without dbplyr	5m 19s
ubuntu-22.04 (oldrel-2)	10m 20s
Without DiagrammeR	5m 31s
ubuntu-22.04 (oldrel-3)	8m 27s
Without DiagrammeRsvg	5m 58s
ubuntu-20.04 (release) SQL Server without covr	12m 21s
Without duckdb	7m 13s
ubuntu-22.04 (release) Postgres with covr	13m 16s
Without forcats	6m 51s
ubuntu-22.04 (release) MariaDB with covr	18m 7s
Without htmlwidgets	5m 32s
ubuntu-22.04 (release) MySQL with covr	5m 33s
Without keyring	7m 41s
ubuntu-22.04 (release) DuckDB with covr	12m 27s
Without labelled	5m 50s
ubuntu-22.04 (release) SQLite with covr	14m 52s
Without mockr	7m 25s
Without nycflights13	6m 51s
Without odbc	6m 33s
Without pixarfilms	6m 6s
Without pool	7m 46s
Without progress	5m 44s
Without reactable	6m 58s
Without RMariaDB	6m 29s
Without RPostgres	6m 9s
Without RSQLite	7m 36s
Without rstudioapi	7m 58s
Without shiny	5m 15s
Without shinyAce	5m 29s
Without shinydashboard	5m 57s
	5h 59m 34s

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