* chore: update test helper for making logs
* chore: add happy case test for severity parser
* feat: get severity parsing processor working and add more happy path tests
* chore: add test for validating severity parser doesn't spam collector logs
* chore: add if condition to generated severity_parser operators
* chore: add postablePipeline validation for severity parser
* chore: minor cleanup in tests
* chore: allow trace and fatal in severity mappings
