[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/notification_push_test.go

@@ -27,6 +27,7 @@ import (
 )
 
 func TestDoesNotifyPropsAllowPushNotification(t *testing.T) {
+	mainHelper.Parallel(t)
 	tt := []struct {
 		name                 string
 		userNotifySetting    string
@@ -431,6 +432,7 @@ func TestDoesNotifyPropsAllowPushNotification(t *testing.T) {
 }
 
 func TestDoesStatusAllowPushNotification(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -646,6 +648,7 @@ func TestDoesStatusAllowPushNotification(t *testing.T) {
 }
 
 func TestGetPushNotificationMessage(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := SetupWithStoreMock(t)
 	defer th.TearDown()
 
@@ -1028,6 +1031,7 @@ func TestGetPushNotificationMessage(t *testing.T) {
 }
 
 func TestBuildPushNotificationMessageMentions(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -1084,6 +1088,7 @@ func TestBuildPushNotificationMessageMentions(t *testing.T) {
 }
 
 func TestSendPushNotifications(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	_, err := th.App.CreateSession(th.Context, &model.Session{
@@ -1104,6 +1109,7 @@ func TestSendPushNotifications(t *testing.T) {
 }
 
 func TestShouldSendPushNotifications(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	t.Run("should return true if forced", func(t *testing.T) {
@@ -1238,6 +1244,7 @@ func (h *testPushNotificationHandler) notificationAcks() []*model.PushNotificati
 }
 
 func TestClearPushNotificationSync(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := SetupWithStoreMock(t)
 	defer th.TearDown()
 
@@ -1314,6 +1321,7 @@ func TestClearPushNotificationSync(t *testing.T) {
 }
 
 func TestUpdateMobileAppBadgeSync(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := SetupWithStoreMock(t)
 	defer th.TearDown()
 
@@ -1373,6 +1381,7 @@ func TestUpdateMobileAppBadgeSync(t *testing.T) {
 }
 
 func TestSendTestPushNotification(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -1400,6 +1409,7 @@ func TestSendTestPushNotification(t *testing.T) {
 }
 
 func TestSendAckToPushProxy(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := SetupWithStoreMock(t)
 	defer th.TearDown()
 
@@ -1444,6 +1454,7 @@ func TestSendAckToPushProxy(t *testing.T) {
 // TestAllPushNotifications is a master test which sends all various types
 // of notifications and verifies they have been properly sent.
 func TestAllPushNotifications(t *testing.T) {
+	mainHelper.Parallel(t)
 	if testing.Short() {
 		t.Skip("skipping all push notifications test in short mode")
 	}
@@ -1554,6 +1565,7 @@ func TestAllPushNotifications(t *testing.T) {
 }
 
 func TestPushNotificationRace(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -1610,6 +1622,7 @@ func TestPushNotificationRace(t *testing.T) {
 }
 
 func TestPushNotificationAttachment(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()