[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/role_test.go

@@ -28,6 +28,7 @@ type permissionInheritanceTestData struct {
 }
 
 func TestGetRolesByNames(t *testing.T) {
+	mainHelper.Parallel(t)
 	testPermissionInheritance(t, func(t *testing.T, th *TestHelper, testData permissionInheritanceTestData) {
 		actualRoles, err := th.App.GetRolesByNames([]string{testData.channelRole.Name})
 		require.Nil(t, err)
@@ -42,6 +43,7 @@ func TestGetRolesByNames(t *testing.T) {
 }
 
 func TestGetRoleByName(t *testing.T) {
+	mainHelper.Parallel(t)
 	testPermissionInheritance(t, func(t *testing.T, th *TestHelper, testData permissionInheritanceTestData) {
 		actualRole, err := th.App.GetRoleByName(context.Background(), testData.channelRole.Name)
 		require.Nil(t, err)
@@ -52,6 +54,7 @@ func TestGetRoleByName(t *testing.T) {
 }
 
 func TestGetRoleByID(t *testing.T) {
+	mainHelper.Parallel(t)
 	testPermissionInheritance(t, func(t *testing.T, th *TestHelper, testData permissionInheritanceTestData) {
 		actualRole, err := th.App.GetRole(testData.channelRole.Id)
 		require.Nil(t, err)
@@ -62,6 +65,7 @@ func TestGetRoleByID(t *testing.T) {
 }
 
 func TestGetAllRoles(t *testing.T) {
+	mainHelper.Parallel(t)
 	testPermissionInheritance(t, func(t *testing.T, th *TestHelper, testData permissionInheritanceTestData) {
 		actualRoles, err := th.App.GetAllRoles()
 		require.Nil(t, err)