Merge pull request #7895 from ampproject/fix/pwa-runtime-cache #1730

Job	Run time
Pre run	5s
E2E test: JS (1, 2)	8m 21s
Lint: JS	36s
Lint: CSS	0s
E2E test: JS (2, 2)	4m 34s
Feature tests: PHP 7.4, WP latest	2m 31s
Lint: PHP	40s
Feature tests: PHP 8.4, WP trunk	2m 27s
Static Analysis: PHP	1m 6s
Unit test: JS	33s
Feature tests: PHP 8.3, WP trunk	2m 31s
Feature tests: PHP 8.2, WP trunk	2m 23s
Unit test: PHP 8.0, WP latest	2m 59s
Feature tests: PHP 8.1, WP trunk	2m 42s
Unit test: PHP 8.4, WP trunk	2m 55s
Feature tests: PHP 8.0, WP latest	2m 38s
Unit test: PHP 8.3, WP trunk	2m 48s
Feature tests: PHP 7.4, WP 6.5	2m 13s
Unit test: PHP 8.2, WP trunk	3m 24s
Unit test: PHP 8.1, WP trunk	3m 7s
Unit test: PHP 8.0, WP trunk	2m 50s
Unit test (with coverage): PHP 8.0, WP latest	4m 43s
Unit test: PHP 8.0, WP latest	2m 41s
Unit test: PHP 7.4, WP latest	3m 9s
Unit test: PHP 7.4, WP latest	2m 37s
Unit test: PHP 7.4, WP 6.5	3m 5s
Unit test: PHP 7.4, WP 6.5	2m 40s
	1h 10m 18s

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