chore(deps): update dependency flutter to v3.24.1

[Leptopoda]

fixes: #2391
replaces: #2399, #2404, #2415, #2400, #2406, #2397, #2398

Once reviewed, I'll sqash all commits together.
I had to disable custom_lint in our CI as it started analyzing files outside the package scope (mainly the symlinks to the pub cache with all our dependencies).

Now that we require dart 3.5 I'm looking into using dart workspaces.

[provokateurin]

I had to disable custom_lint in our CI as it started analyzing files outside the package scope

This sounds bad, I assume it is an upstream bug that should be fixed before we continue here?

[provokateurin]

I would prefer to independently merge the package updates that are not necessary for updating the flutter version (should be rxdart, process_run and build_runner) and the pubspec.lock maintenance.

[provokateurin]

I assume you validated that the analyzer correctly works again in neon_framework?

[Leptopoda]

This sounds bad, I assume it is an upstream bug that should be fixed before we continue here?

This is an old bug that we also had before. custom_lint basically scans for *.dart without caring where the file is located.
We might be able to work around it with a melos exec "dart run custom_lint test && dart run custom_lint lib" so it only scans in folders where we want to.

I assume you validated that the analyzer correctly works again in neon_framework?

I've tried this to my best and could not find any issues.

---

I forgot to bump the CI dart version. This is probably the reason it fails rn.

[provokateurin]

LGTM, but please fix the CI and also make sure to have a clean history of changes (so that we can properly revert if necessary).

[provokateurin]

Is this necessary?

[provokateurin]

To me it doesn't look like all the changes here are necessary.