MU WPCOM: Port the starter-page-templates feature from ETK #60654

Job	Run time
Changelogger use	16s
detect changed files	8s
Changelogger validity	37s
Copied files are in sync	7s
Project structure	2m 46s
PHP lint (7.0)	28s
PHP Compatibility	1m 14s
PHP Code Sniffer (non-excluded files only)	1m 55s
PHP lint (7.2)	41s
Check linter exclude lists	2m 34s
PHP lint (7.4)	32s
ESLint (non-excluded files only)	2m 59s
PHP lint (8.0)	31s
PHP lint (8.1)	35s
ESLint (changes to excluded files only)	0s
Lint GitHub Actions yaml files	0s
PHP lint (8.2)	39s
PHP Code Sniffer (changes to excluded files only)	0s
PHP lint (8.3)	34s
Lock files are up to date	2m 24s
Monorepo package version refs	1m 44s
	20m 44s

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