[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/preference_test.go

@@ -16,6 +16,7 @@ import (
 )
 
 func TestGetPreferences(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -87,6 +88,7 @@ func TestGetPreferences(t *testing.T) {
 }
 
 func TestGetPreferencesByCategory(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -157,6 +159,7 @@ func TestGetPreferencesByCategory(t *testing.T) {
 }
 
 func TestGetPreferenceByCategoryAndName(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -226,6 +229,7 @@ func TestGetPreferenceByCategoryAndName(t *testing.T) {
 }
 
 func TestUpdatePreferences(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -305,6 +309,7 @@ func TestUpdatePreferences(t *testing.T) {
 }
 
 func TestUpdatePreferencesOverload(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -341,6 +346,7 @@ func TestUpdatePreferencesOverload(t *testing.T) {
 }
 
 func TestUpdatePreferencesWebsocket(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -392,6 +398,7 @@ func TestUpdatePreferencesWebsocket(t *testing.T) {
 }
 
 func TestUpdateSidebarPreferences(t *testing.T) {
+	mainHelper.Parallel(t)
 	t.Run("when favoriting a channel, should add it to the Favorites sidebar category", func(t *testing.T) {
 		th := Setup(t).InitBasic()
 		defer th.TearDown()
@@ -619,6 +626,7 @@ func TestUpdateSidebarPreferences(t *testing.T) {
 }
 
 func TestDeletePreferences(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -689,6 +697,7 @@ func TestDeletePreferences(t *testing.T) {
 }
 
 func TestDeletePreferencesOverload(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	client := th.Client
@@ -725,6 +734,7 @@ func TestDeletePreferencesOverload(t *testing.T) {
 }
 
 func TestDeletePreferencesWebsocket(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -778,6 +788,7 @@ func TestDeletePreferencesWebsocket(t *testing.T) {
 }
 
 func TestDeleteSidebarPreferences(t *testing.T) {
+	mainHelper.Parallel(t)
 	t.Run("when removing a favorited channel preference, should remove it from the Favorites sidebar category", func(t *testing.T) {
 		th := Setup(t).InitBasic()
 		defer th.TearDown()
@@ -993,6 +1004,7 @@ func TestDeleteSidebarPreferences(t *testing.T) {
 }
 
 func TestUpdateLimitVisibleDMsGMs(t *testing.T) {
+	mainHelper.Parallel(t)
 	t.Run("Update limit_visible_dms_gms to a valid value", func(t *testing.T) {
 		th := Setup(t).InitBasic()
 		defer th.TearDown()