[code-infra] Remove CI coverage collection and upload to Codecov (#4287)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: Janpot

.circleci/config.yml

@@ -67,11 +67,9 @@ jobs:
           package-overrides: react@<< parameters.react-version >>
       - run:
           name: Run tests on JSDOM
-          command: pnpm test:jsdom:coverage
+          command: pnpm test:jsdom
       - store_test_results:
           path: test-results
-      - code-infra/upload-coverage:
-          key: << parameters.react-version >>-jsdom
   docs_validate:
     <<: *default-job
     steps:
@@ -166,11 +164,9 @@ jobs:
           package-overrides: react@<< parameters.react-version >>
       - run:
           name: Run tests on headless Chromium
-          command: pnpm test:chromium --coverage
+          command: pnpm test:chromium
       - store_test_results:
           path: test-results
-      - code-infra/upload-coverage:
-          key: << parameters.react-version >>-browser
   test_regressions:
     <<: *default-job
     resource_class: 'medium+'
@@ -234,7 +230,7 @@ jobs:
       - build-with-compiler
       - run:
           name: Run tests on JSDOM
-          command: pnpm test:jsdom:coverage
+          command: pnpm test:jsdom
           environment:
             MUI_DISABLE_WORKSPACE_ALIASES: 1
       - store_test_results:
@@ -252,7 +248,7 @@ jobs:
       - build-with-compiler
       - run:
           name: Run tests on headless Chromium
-          command: pnpm test:chromium --coverage
+          command: pnpm test:chromium
           environment:
             MUI_DISABLE_WORKSPACE_ALIASES: 1
       - store_test_results: