Grouping of streamed audit event in the UI by type to allow for easy filtering
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### Problem to solve
In https://gitlab.com/gitlab-org/gitlab/-/issues/344846+ the ~frontend is being added to display a simple list of available filter options that it fetches from https://gitlab.com/gitlab-org/gitlab/-/issues/344845+. This list could be difficult to parse due to the length and similar names.
### Proposal
It would be an excellent quality of life improvement if the options are grouped, making it easier to find the relevant filters.
The grouping name of the audit event types should be the featureCategory but then transformed from snack case to sentence case. e.g.: `"compliance_management"` to `"Compliance management"`
### Designs
| Full page example | Changes in this issue |
| ------ | ------ |
|  | |
### Intended users
### Implementation plan
* Use lodash `groupBy` to group audit event definitions by feature category
* Use lodash `partition` to partition available events by whether they are selected values or not
* Make sure that selected values are extracted into a special group that appears first called "Selected" and that these events are not displayed again in their categories
* Update specs accordingly
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### Verification steps
* go to [issue-reproduce audit event streams](https://gitlab.com/groups/issue-reproduce/-/audit_events?tab=streams)
* expand destination by selecting it
* Select "Filter by stream event" accordion
* Select "Select events" listbox
* Verify that the audit event types are listed pet category
* Verify that event types you select appear in an extra group called "Selected" which appears first
* Verify that selected event types don't appear anymore in their group (only in "Selected" group)
* Verify that you can fuzzy search for events
* e.g. search for "GPGKEY" -> should show 2 audit event types
* e.g. search for "projekt" -> should show various audit event types with "project" in text
* e.g. search for "allow merge request" -> should show audit event type "allow overrides to approver list per merge request updated"
issue
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