RDV: Add a function_exists guard that prevents fatals #66773

Job	Run time
detect changed files	7s
Changelogger use	21s
Copied files are in sync	7s
Project structure	1m 26s
Changelogger validity	26s
PHP lint (7.2)	28s
PHP lint (7.4)	36s
PHP Code Sniffer (non-excluded files only)	1m 53s
PHP lint (8.0)	44s
PHP Compatibility	1m 28s
PHP lint (8.1)	31s
PHP lint (8.2)	33s
PHP lint (8.3)	30s
PHP Code Sniffer (changes to excluded files only)	0s
PHP lint (8.4)	29s
Check linter exclude lists	0s
ESLint (non-excluded files only)	0s
ESLint (changes to excluded files only)	0s
Lint GitHub Actions yaml files	0s
Lock files are up to date	0s
Monorepo package version refs	0s
	9m 39s

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