Remove `< Browse sites` from sidebar #73024

Job	Run time
Determine tests matrix	5s
Static analysis	8m 23s
Check plugin monorepo dep versions	39s
Storybook tests	3m 15s
PHP tests: PHP 7.2 WP latest	4m 37s
PHP tests: PHP 7.3 WP latest	4m 12s
PHP tests: PHP 7.4 WP latest	4m 29s
PHP tests: PHP 8.0 WP latest	4m 52s
PHP tests: PHP 8.1 WP latest	4m 35s
PHP tests: PHP 8.2 WP latest	3m 49s
PHP tests: PHP 8.3 WP latest	4m 24s
PHP tests: PHP 7.0 WP previous	4m 34s
PHP tests: PHP 8.2 WP previous	4m 7s
PHP tests: PHP 8.2 WP trunk	6m 2s
PHP tests: PHP 7.4 WP latest with WooCommerce	2m 53s
JS tests	2m 29s
	1h 3m 25s

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