Revert "find_psr4_file: Quick exit if psr4_map is not populated (#39646)" #63554

Job	Run time
detect changed files	12s
Copied files are in sync	5s
Project structure	2m 6s
Changelogger use	25s
Changelogger validity	31s
PHP lint (7.0)	34s
PHP lint (7.2)	34s
PHP lint (7.4)	33s
PHP Compatibility	1m 10s
PHP Code Sniffer (non-excluded files only)	1m 52s
PHP lint (8.0)	34s
PHP lint (8.1)	31s
PHP lint (8.2)	36s
PHP Code Sniffer (changes to excluded files only)	0s
ESLint (non-excluded files only)	0s
PHP lint (8.3)	31s
ESLint (changes to excluded files only)	0s
Check linter exclude lists	0s
Lint GitHub Actions yaml files	0s
Monorepo package version refs	0s
Lock files are up to date	0s
	10m 14s

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