Minor Ab fixes before public

What is in this MR

This MR fix a few bugs and remove the feature flag for the builder.

How to test this MR

• Check you can select (only) password fields for the user source authentication method.
• Fixes #2370 (closed) - you should be able to select a value for the current row provider in the custom url of a Link collection element.
• The heading color in the theme setting modal should be updated in real time when you change them.
• It wasn't possible to define a custom color for Heading in a page (in the general tab).
• Check you can access the application builder without the builder or * feature flag.
• The left alignement for multiple element general tabs like Button were named Link instead of left, so open such element general tab and check the left hover text.
• Creating a formula that returned an integer instead of a text was breaking the logic of the display name algo. For instance if you use the Id of a row as label for an input field. This Id wasn't show in the element menu.
• The descrition of the text element is now mentionning the multi-line possibility
• Page duplication adds /{number} instead of directly the number. That way it doesn't break the last page parameter it's at the end of the path.
• Now when you enter a domain name, its case is lowered as domain names are insensitives.

Merge Request Checklist

• changelog.md has been updated if required.
• New/updated Premium/Enterprise features are separated correctly in the premium or enterprise folder
• The latest Chrome and Firefox have been used to test any new frontend features
• Documentation has been updated
• Quality Standards are met
• Performance: tables are still fast with 100k+ rows, 100+ field tables
• The redoc API pages have been updated for any REST API changes
• Our custom API docs are updated for changes to endpoints accessed via api tokens
• The UI/UX has been updated following UI Style Guide