Symfony version(s) affected: 4.3.7/4.3.8

Description
Since 4.3.7, warming translation caches then deploying to a different path results in the warmed cached being ignored and regenerated. I believe this is caused by the change in #34129, which effectively adds the full project path to the cache key for the translator.

How to reproduce

• Warm the translation cache.
• Rename the project directory.
• Warm the translation cache again. At this point, the translation cache file names will change.

For example, var/cache/prod/translations/catalogue.en_GB.FOO.php will be replaced with var/cache/prod/translations/catalogue.en_GB.BAR.php.

Possible Solution
Could the project directory be removed from the paths in "scanned_directories"?