[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/channel_bookmark_test.go

@@ -40,6 +40,7 @@ func createBookmark(name string, bookmarkType model.ChannelBookmarkType, channel
 }
 
 func TestCreateBookmark(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -81,12 +82,13 @@ func TestCreateBookmark(t *testing.T) {
 }
 
 func TestUpdateBookmark(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
 	var updateBookmark *model.ChannelBookmarkWithFileInfo
 
-	var testUpdateAnotherFile = func(th *TestHelper, t *testing.T) {
+	testUpdateAnotherFile := func(th *TestHelper, t *testing.T) {
 		file := &model.FileInfo{
 			Id:              model.NewId(),
 			ChannelId:       th.BasicChannel.Id,
@@ -328,6 +330,7 @@ func TestUpdateBookmark(t *testing.T) {
 }
 
 func TestDeleteBookmark(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -353,6 +356,7 @@ func TestDeleteBookmark(t *testing.T) {
 }
 
 func TestGetChannelBookmarks(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -437,6 +441,7 @@ func TestGetChannelBookmarks(t *testing.T) {
 }
 
 func TestUpdateChannelBookmarkSortOrder(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()