Change order of label and help text in admin visibility controls

What does this MR do and why?

This MR resolves #358861 (closed).

1. It changes order of elements
2. Previously help text was after checkboxes, now it is right after label
3. It adds label to project export section

Describe in detail what your merge request does and why.

Screenshots or screen recordings

before

after

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally

1. Go to Admin > Settings > General
2. Expand Visibility and access controls

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.