fix: remove preceding and trailing whitespace from config

[AlexsLaboratory]

Description

Create recursive function to remove white space during the writing of the config/config.php file. This will remove white space from nested array values as well (hence the recursive function).

Related Issue

• Fixes #33294

Motivation and Context

Solves issues with the SMTP server input where if there were white spaces preceding or succeeding the input the connection would error out. Creates a better user experience for the user as sometimes you may not see that you entered a white space either before or after an input.

How Has This Been Tested?

test environment:

• OS: Ubuntu 22.04 LTS
• Database: PostgreSQL 14
• Web Server: Apache2

Testing Procedure

• Modified PHPUnit testSetValue() test to add white space and the beginning and end of a value and then make sure that the output does not include white space.

Screenshots (if appropriate):

SMTP server address with preceding and succeeding spaces.

Saved value in config/config.php that has preceding and succeeding white spaces removed.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Database schema changes (next release will require increase of minor version instead of patch)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Technical debt
• [ ] Tests only (no source changes)

Checklist:

• [x] Code changes
• [x] Unit tests added
• [x] Acceptance tests added
• [ ] Documentation ticket raised:
• [ ] Changelog item, see TEMPLATE

[update-docs[bot]]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[CLAassistant]

All committers have signed the CLA.

[AlexsLaboratory]

Having trouble getting the tests to run. I have tried to go back and run tests on my machine before I added changes but they still don't all finish properly. Any advice on how to get OC unit tests setup properly on a Ubuntu 22.04 LTS system?