CANTINA-985: Deprecate `wpcom_vip_get_page_by_path()`, `wpcom_vip_term_exists()` and `wpcom_vip_get_page_by_title()` #6280

Job	Run time
WP 6.0.x, multisite: no, JP: yes, PHP: 8.1	19s
WP 6.0.x, multisite: yes, JP: yes, PHP: 8.1	19s
WP 6.1.x, multisite: no, JP: yes, PHP: 8.1	20s
WP 6.1.x, multisite: yes, JP: yes, PHP: 8.1	19s
WP 6.2.x, multisite: no, JP: yes, PHP: 8.1	19s
WP 6.2.x, multisite: yes, JP: yes, PHP: 8.1	17s
WP 6.3.x, multisite: no, JP: yes, PHP: 8.1	14s
WP 6.3.x, multisite: yes, JP: yes, PHP: 8.1	16s
WP latest, multisite: no, JP: yes, PHP: 8.1	19s
WP latest, multisite: yes, JP: yes, PHP: 8.1	15s
WP nightly, multisite: no, JP: yes, PHP: 8.1	18s
WP nightly, multisite: yes, JP: yes, PHP: 8.1	17s
WP latest, multisite: no, JP: no, PHP: 8.1	18s
WP latest, multisite: yes, JP: no, PHP: 8.1	17s
WP nightly, multisite: no, JP: yes, PHP: 8.2	17s
WP nightly, multisite: yes, JP: yes, PHP: 8.2	16s
WP nightly, multisite: no, JP: yes, PHP: 8.3	17s
WP nightly, multisite: yes, JP: yes, PHP: 8.3	16s
	5m 13s

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