Activate `capture_uncaught` for Rollbar [3h]

[AronNovak]

https://github.com/Gizra/drupal-starter/pull/752/files#diff-250e627dae344edf5f0165404b9a138945a8f01194e190aed71eec73b447746aR6

Here we configure capture_uncaught: false, but originally, before we started to optimize Rollbar to not throw a fatal error in complex cases (out of memory error), we could have this enabled.

• Let's re-enable it and try to make the Rollbar tests passing.
• Debug what consumes the memory in that case

[amitaibu]

Please update the description of the PR, as I have no memory of the capture_uncaught 😄