Update jest config for coverage (#64648)

* set files to track for coverage collection

* increase timeout to 4h

* trying to add detectOpenHandles to avoid worker stuck

* update config

* make config paths more common

* update configs

* update jest oss config

* exclude 'tests' folder for coverage

.ci/Jenkinsfile_coverage

@@ -3,7 +3,7 @@
 library 'kibana-pipeline-library'
 kibanaLibrary.load() // load from the Jenkins instance
 
-kibanaPipeline(timeoutMinutes: 180) {
+kibanaPipeline(timeoutMinutes: 240) {
   catchErrors {
     withEnv([
       'CODE_COVERAGE=1', // Needed for multiple ci scripts, such as remote.ts, test/scripts/*.sh, schema.js, etc.

src/dev/jest/config.js

@@ -40,6 +40,7 @@ export default {
   ],
   collectCoverageFrom: [
     'src/plugins/**/*.{ts,tsx}',
+    '!src/plugins/**/{__test__,__snapshots__,__examples__,mocks,tests}/**/*',
     '!src/plugins/**/*.d.ts',
     'packages/kbn-ui-framework/src/components/**/*.js',
     '!packages/kbn-ui-framework/src/components/index.js',

test/scripts/jenkins_xpack.sh

@@ -39,7 +39,7 @@ else
   # build runtime for canvas
   echo "NODE_ENV=$NODE_ENV"
   node ./legacy/plugins/canvas/scripts/shareable_runtime
-  node --max-old-space-size=6144 scripts/jest --ci --verbose --coverage
+  node --max-old-space-size=6144 scripts/jest --ci --verbose --detectOpenHandles --coverage
   # rename file in order to be unique one
   test -f ../target/kibana-coverage/jest/coverage-final.json \
     && mv ../target/kibana-coverage/jest/coverage-final.json \

x-pack/dev-tools/jest/create_jest_config.js

@@ -34,6 +34,20 @@ export function createJestConfig({ kibanaDirectory, xPackKibanaDirectory }) {
       '^test_utils/stub_web_worker': `${xPackKibanaDirectory}/test_utils/stub_web_worker.ts`,
       '^(!!)?file-loader!': fileMockPath,
     },
+    collectCoverageFrom: [
+      'legacy/plugins/**/*.{js,jsx,ts,tsx}',
+      'legacy/server/**/*.{js,jsx,ts,tsx}',
+      'plugins/**/*.{js,jsx,ts,tsx}',
+      '!**/{__test__,__snapshots__,__examples__,integration_tests,tests}/**',
+      '!**/*.test.{js,ts,tsx}',
+      '!**/flot-charts/**',
+      '!**/test/**',
+      '!**/build/**',
+      '!**/scripts/**',
+      '!**/mocks/**',
+      '!**/plugins/apm/e2e/**',
+    ],
+    coveragePathIgnorePatterns: ['.*\\.d\\.ts'],
     coverageDirectory: '<rootDir>/../target/kibana-coverage/jest',
     coverageReporters: !!process.env.CODE_COVERAGE ? ['json'] : ['html'],
     setupFiles: [