Fix: issue when clearing cache with opcache with enable_file_override

[Tofandel]

Questions	Answers
Branch?	8.1.x
Description?	With op cache enabled with enable_file_override=1 and validate_timestamps=0 when clearing the cache from the admin the var/cache/prop/appParameters.php file is created with permissions 000 and is then unreadable and needs to be removed manually, this is because file_exists will return true, but fileperms will return 0 because the file doesn't actually exist
Type?	bug fix
Category?	BO
BC breaks?	no
Deprecations?	no
How to test?	Enable opcache with the settings, go to clear the cache, if there is no persisting error 500 it's working correctly

In any case it's a good idea to also reset opcache when the user clears the cache manually

[prestonBot]

Hi, thanks for this contribution!

I found some issues with the Pull Request description:

• Your pull request does not seem to fix any issue, consider creating one (see note below) and linking it by writing Fixes #1234.

Would you mind having a look at it? This will help us understand how interesting your contribution is, thank you very much!

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[kpodemski]

hey @Tofandel

there are some problems with your PR:

1. There's problem with code formatting
2. There's a merge commit available, you need to use rebase option instead of regular pull in order to sync your branch with the upstream branch.

You can also propose this change against the 8.1.x branch because it's a valid improvement 👍🏻

[Tofandel]

I rebased on 8.1.x and fixed the style issue

[hibatallahAouadni]

Hello @Tofandel

LGTM, QA ✅ and auto tests are 🟢 except the Product V2 and it's not related to your PR.
https://github.com/hibatallahAouadni/testing_pr/actions/runs/5975852106

Thanks!

[prestonBot]

QA approved, well done! Message to the maintainers: do not forget to milestone it before the merge.