Disable loading of Custom CSS for atomic sites in `jetpack-mu-wpcom` #58965

Job	Run time
detect changed files	11s
Changelogger use	20s
Changelogger validity	34s
Copied files are in sync	8s
Project structure	1m 47s
PHP Code Sniffer (non-excluded files only)	2m 0s
PHP Compatibility	1m 12s
PHP lint (7.0)	29s
ESLint (non-excluded files only)	0s
ESLint (changes to excluded files only)	0s
PHP lint (7.2)	36s
PHP Code Sniffer (changes to excluded files only)	0s
PHP lint (7.4)	29s
PHP lint (8.0)	34s
PHP lint (8.1)	30s
Check linter exclude lists	0s
PHP lint (8.2)	35s
Lint GitHub Actions yaml files	0s
PHP lint (8.3)	38s
Lock files are up to date	0s
Monorepo package version refs	0s
	10m 3s

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