chore: upgrade flutter packages

[Nirajn2311]

Checklist:

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)

Updating the packages first so that it becomes easier to migrate to Gradle 8 and Flutter 3.19 along with replacing older unmaintained packages.

Packages to replace

• font awesome flutter with system icons
• sqflite_migration_service - with sqflite methods
• html - look into using dart:html
• fk_user_agent - replace with https://pub.dev/packages/ua_client_hints
• flutter_custom_tabs - do we still want this?

[Sembauke]

flutter_custom_tabs - do we still want this?

Yes this is for secure login, we are using this because google does not allow us to login from a regular WebView. Or it would send us a warning about it via email.

font awesome flutter with system icons

We can get rid of this if we find replacing icons we want to use. I presume we use this for the preview button for the projects.