[11.x] Optimize `loadTranslationsFrom` function for simplicity and clarity #44202

Job	Run time
PHP 8.2 - PHPUnit 10.5 - prefer-lowest - Windows	2m 36s
PHP 8.2 - PHPUnit 10.5.12 - prefer-lowest	2m 2s
PHP 8.2 - PHPUnit 10.5 - prefer-stable - Windows	2m 27s
PHP 8.2 - PHPUnit 10.5.12 - prefer-stable	2m 17s
PHP 8.2 - PHPUnit 11.0.1 - prefer-lowest - Windows	2m 24s
PHP 8.2 - PHPUnit 11.3.2 - prefer-lowest	1m 58s
PHP 8.2 - PHPUnit 11.3.2 - prefer-stable	1m 58s
PHP 8.2 - PHPUnit 11.0.1 - prefer-stable - Windows	2m 26s
PHP 8.3 - PHPUnit 10.5.12 - prefer-lowest	2m 38s
PHP 8.3 - PHPUnit 10.5.12 - prefer-stable	2m 31s
PHP 8.3 - PHPUnit 10.5 - prefer-lowest - Windows	2m 24s
PHP 8.3 - PHPUnit 11.3.2 - prefer-lowest	1m 48s
PHP 8.3 - PHPUnit 10.5 - prefer-stable - Windows	2m 22s
PHP 8.3 - PHPUnit 11.0.1 - prefer-lowest - Windows	2m 43s
PHP 8.3 - PHPUnit 11.3.2 - prefer-stable	2m 3s
PHP 8.3 - PHPUnit 11.0.1 - prefer-stable - Windows	2m 57s
PHP 8.4 - PHPUnit 10.5.12 - prefer-lowest	2m 1s
PHP 8.4 - PHPUnit 10.5 - prefer-stable - Windows	2m 17s
PHP 8.4 - PHPUnit 10.5.12 - prefer-stable	1m 54s
PHP 8.4 - PHPUnit 11.0.1 - prefer-stable - Windows	2m 30s
PHP 8.4 - PHPUnit 11.3.2 - prefer-lowest	2m 1s
PHP 8.4 - PHPUnit 11.3.2 - prefer-stable	1m 48s
	50m 5s

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