Fix deprecated `_admin_bar_bump_cb`; Fix failing PHP unit tests #10993

Job	Run time
Pre run	5s
E2E test: JS	14m 27s
Lint: CSS	0s
Build: ${{ matrix.build }} build ZIP	0s
Feature test: PHP 7.4, WP latest	3m 31s
Feature test: PHP 8.3, WP trunk	3m 46s
Lint: JS	0s
Lint: PHP	1m 5s
Feature test: PHP 8.2, WP trunk	3m 37s
Feature test: PHP 8.1, WP trunk	3m 35s
Normalize composer.json	17s
Feature test: PHP 8.0, WP latest	4m 8s
Static Analysis: PHP	1m 41s
Unit test: JS	0s
Feature test: PHP 7.4, WP 5.3	3m 50s
Unit test: PHP 8.0, WP latest	3m 42s
Unit test: PHP 8.3, WP trunk	3m 42s
Unit test: PHP 8.2, WP trunk	4m 10s
Unit test: PHP 8.1, WP trunk	4m 16s
Unit test: PHP 8.0, WP trunk	4m 38s
Unit test (with coverage): PHP 8.0, WP latest	7m 1s
Unit test: PHP 8.0, WP latest	4m 3s
Unit test: PHP 7.4, WP latest	4m 26s
Unit test: PHP 7.4, WP latest	3m 52s
Unit test: PHP 7.4, WP 5.3	3m 37s
Unit test: PHP 7.4, WP 5.3	4m 47s
Upload plugin ZIPs to Google Cloud Storage	0s
Comment on PR with links to plugin ZIPs	0s
	1h 28m 16s

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