Validate sessions don't create breadcrumbs #124
Description
Mirror of getsentry/team-webplatform-meta#69 but for Mobile SDKs. Please review and then check below or comment. Thanks.
### Tasks
- [x] ~Cocoa (doesn't have session breadcrumbs)~
- [ ] https://github.com/getsentry/sentry-java/issues/2779
- [x] ~Flutter uses native sdks~
- [ ] https://github.com/getsentry/sentry-react-native/issues/3129
- [x] .NET (Removed with https://github.com/getsentry/sentry-dotnet/pull/2333)
- [x] Native (C/C++)