Fix deprecated `_admin_bar_bump_cb`; Fix failing PHP unit tests #11013

Job	Run time
Pre run	5s
Lint: JS	1m 56s
Lint: CSS	55s
Normalize composer.json	15s
Lint: PHP	1m 6s
E2E test: JS	14m 10s
Static Analysis: PHP	1m 21s
Unit test: JS	2m 4s
Unit test: PHP 8.0, WP latest	3m 49s
Build: dev build ZIP	2m 36s
Build: prod build ZIP	2m 24s
Feature test: PHP 7.4, WP latest	3m 19s
Feature test: PHP 8.3, WP trunk	4m 5s
Unit test: PHP 8.3, WP trunk	5m 37s
Unit test: PHP 8.2, WP trunk	3m 56s
Feature test: PHP 8.2, WP trunk	3m 31s
Feature test: PHP 8.1, WP trunk	4m 0s
Feature test: PHP 8.0, WP latest	3m 14s
Unit test: PHP 8.1, WP trunk	4m 44s
Feature test: PHP 7.4, WP 5.3	4m 25s
Unit test: PHP 8.0, WP trunk	5m 6s
Unit test (with coverage): PHP 8.0, WP latest	6m 44s
Unit test: PHP 8.0, WP latest	4m 21s
Unit test: PHP 7.4, WP latest	6m 3s
Unit test: PHP 7.4, WP latest	3m 51s
Unit test: PHP 7.4, WP 5.3	3m 36s
Unit test: PHP 7.4, WP 5.3	4m 43s
Upload plugin ZIPs to Google Cloud Storage	30s
Comment on PR with links to plugin ZIPs	6s
	1h 42m 32s

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