Add net9.0 support - Githubissues

Notes for Reviewers

Mostly just a version bump, but with various domino effects:

We started running out of space on our runners, so includes various workarounds to free up disk space on ubuntu and macos
The analysers in net9.0 raised various new vulnerability warnings that had to be dealt with either by bumping dependencies or ignoring warnings
Had to work around some contention issues with LocalDb

When targeting net8.0-android, trimming has to be disabled. We had it enabled implicitly by setting IsAotCompatible = true for net8.0+ when FrameworkSupportsAot == true. That property has been renamed to EnableAot and we now override this and set it to false when running the android device tests.
To get the iOS device tests running on arm, an x64 runtime identifier had to be used
To get the iOS device tests to run against net8.0-ios, the interpreter has to be enabled explicitly (presumably the default for this was changed between net7.0-ios and net8.0-ios
Disabled some flaky tests