ci: install `svn` before running tests #8782

Job	Run time
WP 6.1.x, multisite: no, JP: yes, PHP: 8.1	2m 5s
WP 6.1.x, multisite: yes, JP: yes, PHP: 8.1	2m 5s
WP 6.2.x, multisite: no, JP: yes, PHP: 8.1	2m 51s
WP 6.2.x, multisite: yes, JP: yes, PHP: 8.1	2m 58s
WP 6.3.x, multisite: no, JP: yes, PHP: 8.1	2m 21s
WP 6.3.x, multisite: yes, JP: yes, PHP: 8.1	2m 18s
WP 6.4.x, multisite: no, JP: yes, PHP: 8.1	2m 5s
WP 6.4.x, multisite: yes, JP: yes, PHP: 8.1	2m 11s
WP 6.5.x, multisite: no, JP: yes, PHP: 8.1	2m 11s
WP 6.5.x, multisite: yes, JP: yes, PHP: 8.1	2m 18s
WP 6.6.x, multisite: no, JP: yes, PHP: 8.1	2m 6s
WP 6.6.x, multisite: yes, JP: yes, PHP: 8.1	2m 16s
WP latest, multisite: no, JP: yes, PHP: 8.1	2m 30s
WP latest, multisite: yes, JP: yes, PHP: 8.1	2m 22s
WP nightly, multisite: no, JP: yes, PHP: 8.1	2m 5s
WP nightly, multisite: yes, JP: yes, PHP: 8.1	2m 31s
WP latest, multisite: no, JP: no, PHP: 8.1	2m 20s
WP latest, multisite: yes, JP: no, PHP: 8.1	2m 25s
WP nightly, multisite: no, JP: yes, PHP: 8.2	2m 6s
WP nightly, multisite: yes, JP: yes, PHP: 8.2	2m 14s
WP nightly, multisite: no, JP: yes, PHP: 8.3	2m 29s
WP nightly, multisite: yes, JP: yes, PHP: 8.3	2m 12s
	50m 59s

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