[9.0](backport #7867) [Chore] Improve error reporting when otel collector fails to start #7875
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What does this PR do?
If OTel collector fails to start say due to incorrect config - the logs do not output what went wrong. The only way to know that is by using
elastic-agent status
command.This PR logs such errors.
Why is it important?
Improve error logging when collector fails to start
Checklist
./changelog/fragments
using the changelog toolThis is an automatic backport of pull request #7867 done by [Mergify](https://mergify.com).