attempt to fix potentially-undefined fn apache_get_modules, only allow upgrade when logged in, fix kiosk routes, misc minor cleanup

[DAcodedBEAT]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context.

• Hopefully addresses AppIntegrityService.php #6621
• added use statement for \Slim\App so PHP can find the class for the kiosk routes (Kiosk Manager / Kiosk page #6628)
• also noticed anyone can currently upgrade the system without being logged in, so I restricted that.

Issue ticket number and link

If anyone is experiencing #6621, feel free to test this.
Closes #6628

Screenshots (if appropriate)

N/A

How should this be manually tested?

• Unclear how to reproduce AppIntegrityService.php #6621
• Hit a kiosk route and see it work (resolves Kiosk Manager / Kiosk page #6628)
• you can test the upgrade by going to the page unauthorized and then again when logged in.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules