[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/group_test.go

@@ -13,6 +13,7 @@ import (
 )
 
 func TestGetGroup(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -35,6 +36,7 @@ func TestGetGroup(t *testing.T) {
 }
 
 func TestGetGroupByRemoteID(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -49,6 +51,7 @@ func TestGetGroupByRemoteID(t *testing.T) {
 }
 
 func TestGetGroupsByType(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 	th.CreateGroup()
@@ -65,6 +68,7 @@ func TestGetGroupsByType(t *testing.T) {
 }
 
 func TestCreateGroup(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -100,6 +104,7 @@ func TestCreateGroup(t *testing.T) {
 }
 
 func TestUpdateGroup(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -117,6 +122,7 @@ func TestUpdateGroup(t *testing.T) {
 }
 
 func TestDeleteGroup(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -131,6 +137,7 @@ func TestDeleteGroup(t *testing.T) {
 }
 
 func TestUndeleteGroup(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -149,6 +156,7 @@ func TestUndeleteGroup(t *testing.T) {
 }
 
 func TestCreateOrRestoreGroupMember(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -163,6 +171,7 @@ func TestCreateOrRestoreGroupMember(t *testing.T) {
 }
 
 func TestDeleteGroupMember(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -180,6 +189,7 @@ func TestDeleteGroupMember(t *testing.T) {
 }
 
 func TestUpsertGroupSyncable(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -206,6 +216,7 @@ func TestUpsertGroupSyncable(t *testing.T) {
 }
 
 func TestUpsertGroupSyncableTeamGroupConstrained(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -234,6 +245,7 @@ func TestUpsertGroupSyncableTeamGroupConstrained(t *testing.T) {
 }
 
 func TestGetGroupSyncable(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -249,6 +261,7 @@ func TestGetGroupSyncable(t *testing.T) {
 }
 
 func TestGetGroupSyncables(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -267,6 +280,7 @@ func TestGetGroupSyncables(t *testing.T) {
 }
 
 func TestDeleteGroupSyncable(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -286,6 +300,7 @@ func TestDeleteGroupSyncable(t *testing.T) {
 }
 
 func TestGetGroupsByChannel(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -320,6 +335,7 @@ func TestGetGroupsByChannel(t *testing.T) {
 }
 
 func TestGetGroupsAssociatedToChannelsByTeam(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -359,6 +375,7 @@ func TestGetGroupsAssociatedToChannelsByTeam(t *testing.T) {
 }
 
 func TestGetGroupsByTeam(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -386,6 +403,7 @@ func TestGetGroupsByTeam(t *testing.T) {
 }
 
 func TestGetGroups(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 	group := th.CreateGroup()
@@ -396,6 +414,7 @@ func TestGetGroups(t *testing.T) {
 }
 
 func TestUserIsInAdminRoleGroup(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 	group1 := th.CreateGroup()