rcc

Remove validation workflow #1513

Job	Run time
Collect suggests deps	31s
Smoke test: stock R	3m 22s
pkgdown	2m 27s
macos-latest (release)	4m 56s
windows-latest (release)	8m 49s
ubuntu-20.04 (release)	4m 1s
windows-latest (4.1)	10m 5s
ubuntu-22.04 (devel)	3m 48s
windows-latest (4.2)	10m 42s
ubuntu-22.04 (release) with covr	4m 43s
ubuntu-22.04 (oldrel-1)	4m 2s
ubuntu-22.04 (oldrel-2)	3m 23s
ubuntu-22.04 (oldrel-3)	4m 30s
ubuntu-22.04 (oldrel-4)	3m 18s
macOS-latest (release) mariadb_config	5m 51s
macOS-latest (release) mysql_config	9m 2s
ubuntu-22.04 (release) MySQL server + client	3m 8s
ubuntu-22.04 (release) MariaDB server, MySQL client	3m 23s
ubuntu-22.04 (release) MySQL server, MariaDB client	3m 28s
ubuntu-22.04 (release) MariaDB server + client	3m 15s
Without DBItest	4m 16s
Without decor	3m 40s
Without readr	3m 41s
Check deps	0s
	1h 48m 21s

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