[master] Make file.manage_file permission, user and group atomic

[m-czernek]

What does this PR do?

In this PR, I tweak the internal behavior of file.manage_file to improve the file permission and owner consistency while the function is executing. See the linked PR for discussion of why this might be useful to users.

In the end, while modifying the code, I found this approach to be the simplest and cleanest; however, I am open to discussions and modifying the approach.

What issues does this PR fix or reference?

Fixes: #65651

Previous Behavior

When the module copied a file, the file temporarily used the 600 perms with the user of the current running process.

New Behavior

Currently, the module attempts to modify the basic file attributes as soon as the file is copied to minimize the risk of race conditions.

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

Yes

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[m-czernek]

Ping @dwoz @felippeb, any chance for a review? :)