[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/oauth_test.go

@@ -25,6 +25,7 @@ import (
 )
 
 func TestGetOAuthAccessTokenForImplicitFlow(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -74,6 +75,7 @@ func TestGetOAuthAccessTokenForImplicitFlow(t *testing.T) {
 }
 
 func TestOAuthRevokeAccessToken(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -92,6 +94,7 @@ func TestOAuthRevokeAccessToken(t *testing.T) {
 }
 
 func TestOAuthDeleteApp(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -135,7 +138,10 @@ func TestOAuthDeleteApp(t *testing.T) {
 }
 
 func TestAuthorizeOAuthUser(t *testing.T) {
+	mainHelper.Parallel(t)
 	setup := func(t *testing.T, enable, tokenEndpoint, userEndpoint bool, serverURL string) *TestHelper {
+		mainHelper.Parallel(t)
+
 		th := Setup(t)
 
 		th.App.UpdateConfig(func(cfg *model.Config) {
@@ -545,6 +551,7 @@ func TestAuthorizeOAuthUser(t *testing.T) {
 }
 
 func TestGetAuthorizationCode(t *testing.T) {
+	mainHelper.Parallel(t)
 	t.Run("not enabled", func(t *testing.T) {
 		th := Setup(t)
 		defer th.TearDown()
@@ -602,6 +609,7 @@ func TestGetAuthorizationCode(t *testing.T) {
 }
 
 func TestDeauthorizeOAuthApp(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -644,6 +652,7 @@ func TestDeauthorizeOAuthApp(t *testing.T) {
 }
 
 func TestDeactivatedUserOAuthApp(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()