Improve error tracking integrated collector

What does this MR do?

Make sure collector is available only if integrated error tracking client is activated. If project uses external Sentry integrations, then there is no use in collector.

Issue #329596 (closed)

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?) => Not needed. Feature is behind a feature flag and is not released yet
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.

Availability and Testing

• I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)