Tests: Custom script to run unit tests filtered by code ownership (#111210)

* feat(script): generate a source file x teams manifest from CODEOWNERS

* feat(script): unit tests + coverage report only for files owned by team

* feat(script): calculate CODEOWNERS metadata

* refactor(script): export a pure codeowners manifest generation function

* refactor(script): export a pure test coverage by team function

* refactor(script): generate raw JSONL codeowners data from Node.js script

* feat(script): put codeowners manifest all together in one script

* refactor(scripts): group consistently with NPM script name

* refactor(scripts): deduplicate constants for file paths etc.

* refactor(scripts): make console output cute 💅✨

* refactor(tests): make coverage by "owner" directory more human readable

* refactor(scripts): use consistent naming "codeowner" instead of "team"

* chore(codeowners): mark DataViz as owners of scripts for now

* chore(todo): leave a note where coverage metrics should be emitted later

* fix(gitignore): ignore root codeowners-manifest directory not scripts/*

* refactor(script): rename manifest to generate for clarity

* docs(readme): add a brief README describing new scrips

* chore(linter): ignore temporary files in prettier, fix whitespace format

* refactor(script): simplify Jest config by using team files list directly

* refactor(script): simplify script, partition sourceFiles and testFiles

* refactor(script): simplify and parallelize manifest write operations

* fix(script): handle errors for JSONL line reader

* refactor(script): use Map instead of POJOs

* fix(script): handle errors when streaming raw JSONL output

* fix(script): add error handling, and use promise API for metadata check

* fix(reporter): suppress duplicate Jest CLI coverage report output

* refactor(script): simplify with fs promises API for consistency

* fix(script): error handling for cp spawn-ed process

* refactor(script): use Promise API for mkdir + exists

* refactor(script): use fs Promise API

* refactor(script): use fs Promise API

* fix(script): same allow list for sourceFilter and all Jest config rules

Co-authored-by: Paul Marbach <paul.marbach@grafana.com>

* fix(script): bust cache when new files are created also

---------

Co-authored-by: Paul Marbach <paul.marbach@grafana.com>

.github/CODEOWNERS

@@ -1058,6 +1058,10 @@ playwright.storybook.config.ts @grafana/grafana-frontend-platform
 /scripts/codemods/explicit-barrel-imports.cjs @grafana/frontend-ops
 /scripts/rtk-client-generator/ @grafana/grafana-search-navigate-organise
 
+/scripts/codeowners-manifest/ @grafana/dataviz-squad
+/scripts/test-coverage-by-codeowner.js @grafana/dataviz-squad
+/jest.config.codeowner.js @grafana/dataviz-squad
+
 /scripts/**/generate-transformations* @grafana/datapro
 /scripts/webpack/ @grafana/frontend-ops
 /scripts/generate-a11y-report.sh @grafana/grafana-frontend-platform