Do not consider user-defined sentry integration versions when auto-installing and print a warning

[romtsn]

📜 Description

• Do not consider user-defined sentry integrations when auto-installing anymore. This is necessary because we want to align integrations versions to the same one as sentry-android-core or sentry or sentry-android is. Only if the user has directly defined one of the core versions, we will use that to install integrations, otherwise sentryVersion is used.

This means if the user has defined something like that:

// direct deps
dependencies {
  implementation 'io.sentry:sentry-android-core:7.0.0'
  implementation 'io.sentry:sentry-android-okhttp:6.34.0'
}

// or with the gradle plugin
sentry {
  autoInstallation.sentryVersion = '7.0.0'
}

dependencies {
  implementation 'io.sentry:sentry-android-okhttp:6.34.0'
}

Then in both cases it will use 7.0.0 for the -okhttp integration

• We also print a warning if we have overridden user-defined version to a newer one
• Change mocked backend as the old one was not available
• Do not report errors to Sentry when running tests (telemetry)

💡 Motivation and Context

Closes #324

💚 How did you test it?

Manually + automated

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• [] No breaking changes

🔮 Next steps

[adinauer]

LGTM