Fixed #15344 - make select2 for countries freeform-ish

[snipe]

This is a sort of compromise for #15344, which correctly asserts that we do not validate country value on the API or importer. We cannot do that since the data sources on the admin's side may not comply with ISO 3166-1 alpha-2 codes or UK's extended codes, and would lead to model-level validation when those codes don't match when being entered/updated via API, CSV import, or SCIM (since the source data in the LDAP directory, SCIM directory, etc might not be compliant.)

The challenge is that if that info from the directory didn't match the ISO two letter codes, the field value for country would be accepted, but it would not be selected (since that arbitrary value doesn't exist in our countries array so it would never find a match to mark as the selected option) and thus that country value would be dropped on saving if the user didn't notice nothing was selected.

Screen.Recording.2024-08-22.at.11.03.07.AM.mov

[what-the-diff]

PR Summary

• Localization Updates
  The pull request makes changes to our localizations. Previously, the United Kingdom was only labeled as 'UK'. Now the application will differentiate between England ('GB-ENG'), Northern Ireland ('GB-NIR'), Scotland ('GB-SCT') and Wales ('GB-WLS').

• Improved macBegDropDown() Function
  The macBegDropDown() function in resources/macros/macros.php has been optimized to better handle the selection of country values. If the country value already exists in the array it is selected, otherwise it gets added as a new option.

• HTML select Element Enhancement
  The select element attribute data-tags value has been changed to "true", which means tags can be used. Furthermore, if a selected country value is not available in our options, it creates a new option with the selected country value and labels it as 'New'.

• Code Cleanup
  Unnecessary comments and redundant variable declarations in resources/macros/macros.php have been removed for better code readability and performance.