Fix deprecated `_admin_bar_bump_cb`; Fix failing PHP unit tests #11012

Job	Run time
Pre run	8s
Lint: CSS	1m 19s
Normalize composer.json	13s
Lint: JS	1m 33s
Lint: PHP	1m 0s
Static Analysis: PHP	1m 35s
Unit test: JS	1m 33s
E2E test: JS	6m 27s
Unit test: PHP 8.0, WP latest	3m 40s
Unit test: PHP 8.3, WP trunk	4m 3s
Unit test: PHP 8.2, WP trunk	3m 41s
Feature test: PHP 7.4, WP latest	3m 55s
Unit test: PHP 8.1, WP trunk	4m 19s
Build: dev build ZIP	2m 33s
Feature test: PHP 8.3, WP trunk	4m 22s
Build: prod build ZIP	2m 45s
Unit test: PHP 8.0, WP trunk	4m 48s
Feature test: PHP 8.2, WP trunk	3m 26s
Unit test (with coverage): PHP 8.0, WP latest	5m 55s
Feature test: PHP 8.1, WP trunk	4m 47s
Unit test: PHP 8.0, WP latest	3m 54s
Feature test: PHP 8.0, WP latest	3m 12s
Unit test: PHP 7.4, WP latest	4m 37s
Feature test: PHP 7.4, WP 5.3	4m 28s
Unit test: PHP 7.4, WP latest	4m 0s
Unit test: PHP 7.4, WP 5.3	5m 0s
Unit test: PHP 7.4, WP 5.3	3m 53s
Upload plugin ZIPs to Google Cloud Storage	32s
Comment on PR with links to plugin ZIPs	4s
	1h 31m 42s

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