Discard invalid navigation and interaction root spans using event processor instead sampled=false

[krystofwoldrich]

Description

This will resolved confusing dropped transactions and spans due to sampling, although sample_rate=1.

Current use of sampled=false.

sentry-react-native/packages/core/src/js/tracing/onSpanEndUtils.ts

Line 86 in 18ce5e8

span['_sampled'] = false;

sentry-react-native/packages/core/src/js/tracing/onSpanEndUtils.ts

Line 111 in 18ce5e8

span['_sampled'] = false;

sentry-react-native/packages/core/src/js/tracing/reactnativenavigation.ts

Line 214 in 18ce5e8

latestNavigationSpan['_sampled'] = false;

sentry-react-native/packages/core/src/js/tracing/reactnavigation.ts

Line 333 in f2d10b7

latestNavigationSpan['_sampled'] = false;