Refactored Barcode Settings into Label Settings

[Godmartinz]

Description

This removes the barcode settings from the admin settings menu and adds the functionality into the Labels settings.

Old Barcodes settings:

New labels settings with barcodes settings integrated:

(NOTE: the purge button works)

On the backend, the postBarcodes and getBarcodes have been integrated with the postLabels and getLabels respectively.

Also rephrased "Display Square Codes" to "Display 2D Barcode" for uniformity.
Labels work 👍 :

Fixes #[sc-26651]

Type of change

Please delete options that are not relevant.

• [] Bug fix (non-breaking change which fixes an issue)
• [x ] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x ] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A
• Test B

Test Configuration:

• PHP version:
• MySQL version
• Webserver version
• OS version

Checklist:

• I have read the Contributing documentation available here: https://snipe-it.readme.io/docs/contributing-overview
• I have formatted this PR according to the project guidelines: https://snipe-it.readme.io/docs/contributing-overview#pull-request-guidelines
• My code follows the style guidelines of this project
• I have performed a self-review of my own 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

[what-the-diff]

PR Summary

• Introduction of Conditional Display in Settings
  This update adds a new functionality in the settings of our application. The system can now check certain conditions and according to the results, display different elements. Specifically, we're looking at the availability of a certain setting, named label2_enable. If this value is zero, a unique section of the interface will be shown to the user, enhancing the adaptability of the application.

[snipe]

@Godmartinz I know I was the one that brought this up via Shortcut, but are we sure this isn't going to break things for people? (I.e. is my logic even sound here? Would it be better to just combine the barcodes/labels sections instead of hiding the other settings?)

[Godmartinz]

refactor is complete 🙂 @snipe

[marcusmoore]

Looks good 👍🏾

[Godmartinz]

@snipe I've added a migration to check the new barcode variables if empty and to replace them with the old values, then delete the old columns.