AI CodeFix/Documentation based codefixes

This is maybe 2 issues into one. The idea is that copilot or other agent can do a great job of fixing issues if enough instructions is given on what is the problem.

There are diagnostics that cannot easily write a solid codefix logic because they would for example require fixing things in multiple places but this is somewhere an AI agent could shine.

The 2 parts to this are:
1. Finding how we can integrate codefixes with copliot. It might just be that the diagnostic needs to have the fix instruction there and vscode or other AI ide can resolve it automatically with the "try to fix with copilot"
2. See if we need a separate instruction based codefix or that it should just be part of the diagnostic message.