[MM-62408] Server Code Coverage with Fully Parallel Tests (#30078)

* TestPool

* Store infra

* Store tests updates

* Bump maximum concurrent postgres connections

* More infra

* channels/jobs

* channels/app

* channels/api4

* Protect i18n from concurrent access

* Replace some use of os.Setenv

* Remove debug

* Lint fixes

* Fix more linting

* Fix test

* Remove use of Setenv in drafts tests

* Fix flaky TestWebHubCloseConnOnDBFail

* Fix merge

* [MM-62408] Add CI job to generate test coverage (#30284)

* Add CI job to generate test coverage

* Remove use of Setenv in drafts tests

* Fix flaky TestWebHubCloseConnOnDBFail

* Fix more Setenv usage

* Fix more potential flakyness

* Remove parallelism from flaky test

* Remove conflicting env var

* Fix

* Disable parallelism

* Test atomic covermode

* Disable parallelism

* Enable parallelism

* Add upload coverage step

* Fix codecov.yml

* Add codecov.yml

* Remove redundant workspace field

* Add Parallel() util methods and refactor

* Fix formatting

* More formatting fixes

* Fix reporting

server/channels/app/server_test.go

@@ -54,6 +54,7 @@ func newServerWithConfig(t *testing.T, f func(cfg *model.Config)) (*Server, erro
 }
 
 func TestStartServerSuccess(t *testing.T) {
+	mainHelper.Parallel(t)
 	s, err := newServerWithConfig(t, func(cfg *model.Config) {
 		*cfg.ServiceSettings.ListenAddress = "localhost:0"
 	})
@@ -70,6 +71,7 @@ func TestStartServerSuccess(t *testing.T) {
 }
 
 func TestStartServerPortUnavailable(t *testing.T) {
+	mainHelper.Parallel(t)
 	// Listen on the next available port
 	listener, err := net.Listen("tcp", "localhost:0")
 	require.NoError(t, err)
@@ -88,6 +90,7 @@ func TestStartServerPortUnavailable(t *testing.T) {
 }
 
 func TestStartServerNoS3Bucket(t *testing.T) {
+	mainHelper.Parallel(t)
 	s3Host := os.Getenv("CI_MINIO_HOST")
 	if s3Host == "" {
 		s3Host = "localhost"
@@ -140,6 +143,7 @@ func TestStartServerNoS3Bucket(t *testing.T) {
 }
 
 func TestStartServerTLSSuccess(t *testing.T) {
+	mainHelper.Parallel(t)
 	s, err := newServerWithConfig(t, func(cfg *model.Config) {
 		testDir, _ := fileutils.FindDir("tests")
 
@@ -165,6 +169,7 @@ func TestStartServerTLSSuccess(t *testing.T) {
 }
 
 func TestStartServerTLSVersion(t *testing.T) {
+	mainHelper.Parallel(t)
 	configStore, _ := config.NewMemoryStore()
 	store, _ := config.NewStoreFromBacking(configStore, nil, false)
 	cfg := store.Get()
@@ -205,7 +210,6 @@ func TestStartServerTLSVersion(t *testing.T) {
 	}
 
 	err = checkEndpoint(t, client, "https://localhost:"+strconv.Itoa(s.ListenAddr.Port)+"/")
-
 	if err != nil {
 		t.Errorf("Expected nil, got %s", err)
 	}
@@ -215,6 +219,7 @@ func TestStartServerTLSVersion(t *testing.T) {
 }
 
 func TestStartServerTLSOverwriteCipher(t *testing.T) {
+	mainHelper.Parallel(t)
 	s, err := newServerWithConfig(t, func(cfg *model.Config) {
 		testDir, _ := fileutils.FindDir("tests")
 
@@ -280,6 +285,7 @@ func checkEndpoint(t *testing.T, client *http.Client, url string) error {
 }
 
 func TestPanicLog(t *testing.T) {
+	mainHelper.Parallel(t)
 	// Creating a temp dir for log
 	tmpDir, err := os.MkdirTemp("", "mlog-test")
 	require.NoError(t, err, "cannot create tmp dir for log file")
@@ -347,8 +353,8 @@ func TestPanicLog(t *testing.T) {
 	s.Shutdown()
 
 	// Checking whether panic was logged
-	var panicLogged = false
-	var infoLogged = false
+	panicLogged := false
+	infoLogged := false
 
 	logFile, err := os.Open(config.GetLogFileLocation(tmpDir))
 	require.NoError(t, err, "cannot open log file")
@@ -494,6 +500,7 @@ func TestSentry(t *testing.T) {
 }
 
 func TestCancelTaskSetsTaskToNil(t *testing.T) {
+	mainHelper.Parallel(t)
 	var taskMut sync.Mutex
 	task := model.CreateRecurringTaskFromNextIntervalTime("a test task", func() {}, 5*time.Minute)
 	require.NotNil(t, task)
@@ -503,6 +510,7 @@ func TestCancelTaskSetsTaskToNil(t *testing.T) {
 }
 
 func TestOriginChecker(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()