Remove execute bit on files that do not need it #19052

Description:

Because execute bit might be a security risk and has no useful
purpose for files that are not meant to be executed in the first place.

I'd recommend to all Matomo developers to ensure that git config core.fileMode is set, to stop ignoring those errors. This can be done via:

git config core.fileMode true

Review

• [ ] Functional review done
• [ ] Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done
• [ ] Wording review done
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed

Thanks for creating this PR.
Running Matomo from git checkout is not recommended. But changing the file mode make sense nevertheless.