[Chore] Deprecate and remove user.segment

[AbhiPrasad]

Description

As per getsentry/sentry#58767 (comment), user segment is deprecated from the user interface and the SDK.

Let's work to remove support for this across the SDKs.

Tasks

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1. feat: Deprecate user segment field sentry-javascript#10210
   +0
2. Deprecate user segment sentry-php#1681
   Type: Deprecation +1
   
3. Deprecate user.segment sentry-python#2718
   SDK 2.0 +1
4. feat: Remove usage of user segment sentry-ruby#2493
   +0
   
5. feat: Remove user segment sentry-go#928
   +0
   
6. Deprecate and remove user.segment sentry-java#3497
   Platform: Android Platform: Java +2
   
7. Deprecate SentryUser.segment sentry-cocoa#4090
   Platform: Cocoa +1
   
8. Remove SentryUser.segment sentry-cocoa#4093
   Breaking-change Platform: Cocoa +2
9. Deprecate and remove user segment sentry-dart#2115
   Platform: Dart +1
   
10. React Native
11. Deprecate and Remove User Segment sentry-dotnet#3840
    +0

RFC

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Slack-Channel

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Notion Document(s)

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Stakeholder(s)

@AbhiPrasad

Team(s)

Mobile, Web Backend, Web Frontend

[krystofwoldrich]

For RN, it was deprecated when deprecated in JS and will be removed in RN V6 (includes JS V8).