[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/api4/status_test.go

@@ -15,6 +15,7 @@ import (
 )
 
 func TestGetUserStatus(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -79,7 +80,7 @@ func TestGetUserStatus(t *testing.T) {
 	})
 
 	t.Run("get other user status", func(t *testing.T) {
-		//Get user2 status logged as user1
+		// Get user2 status logged as user1
 		userStatus, _, err := client.GetUserStatus(context.Background(), th.BasicUser2.Id, "")
 		require.NoError(t, err)
 		assert.Equal(t, "offline", userStatus.Status)
@@ -102,6 +103,7 @@ func TestGetUserStatus(t *testing.T) {
 }
 
 func TestGetUsersStatusesByIds(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -185,6 +187,7 @@ func TestGetUsersStatusesByIds(t *testing.T) {
 }
 
 func TestUpdateUserStatus(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -249,6 +252,7 @@ func TestUpdateUserStatus(t *testing.T) {
 }
 
 func TestUpdateUserCustomStatus(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -351,6 +355,7 @@ func TestUpdateUserCustomStatus(t *testing.T) {
 }
 
 func TestRemoveUserCustomStatus(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client