Integration tests are flaky on linux-musl-x64 runners

[jamescrosswell]

Description

The integration tests aren't quite failing... they just never complete and there's no error in the logs.

See:

• https://github.com/getsentry/sentry-dotnet/actions/runs/19877392463/job/56967856579?pr=4787
• https://github.com/getsentry/sentry-dotnet/actions/runs/19875397020/attempts/1?pr=4786
• https://github.com/getsentry/sentry-dotnet/actions/runs/19845864911/job/56956717059?pr=4761

Temporary

Just to unblock CI, I've disabled the integration tests on Linux musl x64:

• Disable integration tests on linux-musl-x64 #4789

[linear]

NET-546