Use /envelope endpoint when Performance Monitoring is enabled

[HazAT]

AND attach DSC to envelope header to all outgoing events

Relay PR: getsentry/relay#1983

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1. Javascript: Adding the DSC to all envelope headers sentry-javascript#7819
2. Node: Adding the DSC to all envelope headers sentry-javascript#7819
3. Python: Send all events to /envelope endpoint when tracing is enabled sentry-python#2009
4. PHP ref: Sent all events to the /envelope endpoint if tracing is enabled sentry-php#1518
5. Java
6. .NET
7. Ruby
8. Go

Fixes: #45

[adinauer]

Found no trace of using /store endpoint in Java SDK, only /envelope. DSC is attached to envelope headers for transactions and errors.

[bruno-garcia]

/store was dropped on cocoa/android/java/dotnet/dart in 2021 or earlier