Remove src/metrics, moved to technical-content (#63121)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: cf82fd62-db1e-4338-bc63-e3f6ed8c53d6
Copilot-Session: 276b099c-ba9c-4151-a28d-033e4c59bc0f
Copilot-Session: 326b6626-cae6-410a-85a0-ac447a4879a5

Author: heiskr

.github/workflows/test.yml

@@ -59,7 +59,6 @@ jobs:
           - landings
           - languages
           - links
-          # - metrics
           - observability
           # - pages
           - products

eslint.config.ts

@@ -195,7 +195,6 @@ export default [
       'src/events/components/**/*.{ts,js}',
       'src/fixtures/**/*.{ts,js}',
       'src/journeys/**/*.{ts,js}',
-      'src/metrics/**/*.{ts,js}',
       'src/observability/lib/handle-package-not-found.ts',
     ],
     rules: {