Fix deprecated `_admin_bar_bump_cb`; Fix failing PHP unit tests #11008

Job	Run time
Pre run	7s
E2E test: JS	10m 20s
Feature test: PHP 7.4, WP latest	3m 20s
Lint: CSS	56s
Build: dev build ZIP	2m 46s
Feature test: PHP 8.3, WP trunk	3m 47s
Build: prod build ZIP	2m 54s
Feature test: PHP 8.2, WP trunk	3m 28s
Feature test: PHP 8.1, WP trunk	3m 33s
Lint: JS	2m 23s
Lint: PHP	1m 26s
Feature test: PHP 8.0, WP latest	3m 26s
Feature test: PHP 7.4, WP 5.3	3m 2s
Normalize composer.json	15s
Static Analysis: PHP	1m 44s
Unit test: JS	1m 47s
Unit test: PHP 8.0, WP latest	4m 46s
Unit test: PHP 8.3, WP trunk	4m 4s
Unit test: PHP 8.2, WP trunk	3m 44s
Unit test: PHP 8.1, WP trunk	5m 40s
Unit test: PHP 8.0, WP trunk	5m 0s
Unit test (with coverage): PHP 8.0, WP latest	6m 49s
Unit test: PHP 8.0, WP latest	4m 4s
Unit test: PHP 7.4, WP latest	4m 52s
Unit test: PHP 7.4, WP latest	4m 11s
Unit test: PHP 7.4, WP 5.3	4m 24s
Unit test: PHP 7.4, WP 5.3	4m 2s
Upload plugin ZIPs to Google Cloud Storage	31s
Comment on PR with links to plugin ZIPs	9s
	1h 37m 30s

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