Add mandatory parent special case for amp-subscriptions #11640

Job	Run time
Pre run	3s
Static Analysis: PHP	1m 12s
Lint: PHP	53s
E2E test: JS (1, 2)	8m 13s
Lint: CSS	0s
E2E test: JS (2, 2)	4m 53s
Lint: JS	0s
Unit test: PHP 8.0, WP latest	3m 30s
Unit test: PHP 8.3, WP trunk	1m 40s
Build: dev build ZIP	1m 38s
Unit test: PHP 8.2, WP trunk	2m 22s
Feature tests: PHP 7.4, WP latest	2m 50s
Build: prod build ZIP	1m 51s
Unit test: PHP 8.1, WP trunk	2m 45s
Feature tests: PHP 8.3, WP trunk	2m 58s
Unit test: PHP 8.0, WP trunk	2m 48s
Feature tests: PHP 8.2, WP trunk	2m 57s
Unit test (with coverage): PHP 8.0, WP latest	5m 25s
Feature tests: PHP 8.1, WP trunk	2m 58s
Unit test: JS	0s
Unit test: PHP 8.0, WP latest	3m 2s
Feature tests: PHP 8.0, WP latest	2m 52s
Unit test: PHP 7.4, WP latest	3m 40s
Feature tests: PHP 7.4, WP 6.5	3m 5s
Unit test: PHP 7.4, WP latest	2m 39s
Unit test: PHP 7.4, WP 6.5	3m 8s
Unit test: PHP 7.4, WP 6.5	2m 42s
Upload plugin ZIPs to Google Cloud Storage	23s
Comment on PR with links to plugin ZIPs	3s
	1h 10m 30s

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