Deprecate `wpcom_vip_term_exists()` #6286

Job	Run time
WP 6.0.x, multisite: no, JP: yes, PHP: 8.1	6m 49s
WP 6.0.x, multisite: yes, JP: yes, PHP: 8.1	7m 11s
WP 6.1.x, multisite: no, JP: yes, PHP: 8.1	7m 11s
WP 6.1.x, multisite: yes, JP: yes, PHP: 8.1	7m 2s
WP 6.2.x, multisite: no, JP: yes, PHP: 8.1	6m 56s
WP 6.2.x, multisite: yes, JP: yes, PHP: 8.1	7m 12s
WP 6.3.x, multisite: no, JP: yes, PHP: 8.1	7m 17s
WP 6.3.x, multisite: yes, JP: yes, PHP: 8.1	7m 7s
WP latest, multisite: no, JP: yes, PHP: 8.1	12m 43s
WP latest, multisite: yes, JP: yes, PHP: 8.1	13m 9s
WP nightly, multisite: no, JP: yes, PHP: 8.1	7m 7s
WP nightly, multisite: yes, JP: yes, PHP: 8.1	7m 19s
WP latest, multisite: no, JP: no, PHP: 8.1	6m 41s
WP latest, multisite: yes, JP: no, PHP: 8.1	6m 24s
WP nightly, multisite: no, JP: yes, PHP: 8.2	7m 19s
WP nightly, multisite: yes, JP: yes, PHP: 8.2	7m 19s
WP nightly, multisite: no, JP: yes, PHP: 8.3	7m 38s
WP nightly, multisite: yes, JP: yes, PHP: 8.3	7m 42s
	2h 20m 6s

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