chore: Removing RTAs (#4437)

* Delete RTAs

* Delete RTA-related orchestration code

* Drop RTAs from tests

* Remove RTAs from README

* Further cleanup

* Readme update

* Version bump and no more RTAs

* Styling fixes

* Drop RTAs from config files

* Drop `rule-mapping.yaml`

* Bring back event collector / normalizer

* Drop rta mention

* Cleanup rta leftovers

* Style fix

---------

Co-authored-by: Mika Ayenson, PhD <Mikaayenson@users.noreply.github.com>

.github/CODEOWNERS

@@ -5,7 +5,6 @@ tests/**/*.py     @mikaayenson @eric-forte-elastic @terrancedejesus
 detection_rules/  @mikaayenson @eric-forte-elastic @terrancedejesus
 tests/            @mikaayenson @eric-forte-elastic @terrancedejesus
 lib/              @mikaayenson @eric-forte-elastic @terrancedejesus
-rta/              @mikaayenson @eric-forte-elastic @terrancedejesus
 hunting/          @mikaayenson @eric-forte-elastic @terrancedejesus
 
 # skip rta-mapping to avoid the spam

.github/paths-labeller.yml

@@ -12,8 +12,6 @@
   - "detection_rules/**/*.py"
   - "kibana/**/*.py"
   - "kql/**/*.py"
-- "RTA":
-  - "rta/**/*"
 - "Hunting":
   - "hunting/**/*"