[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/ldap_test.go

@@ -101,6 +101,7 @@ MCOV5SHi05kD42JSSbmw190VAa4QRGikaeWRhDsj
 -----END CERTIFICATE-----`
 
 func TestTestLdap(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -127,6 +128,7 @@ func TestTestLdap(t *testing.T) {
 }
 
 func TestSyncLdap(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -175,6 +177,7 @@ func TestSyncLdap(t *testing.T) {
 }
 
 func TestGetLdapGroups(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -190,6 +193,7 @@ func TestGetLdapGroups(t *testing.T) {
 }
 
 func TestLinkLdapGroup(t *testing.T) {
+	mainHelper.Parallel(t)
 	const entryUUID string = "foo"
 
 	th := Setup(t)
@@ -205,6 +209,7 @@ func TestLinkLdapGroup(t *testing.T) {
 }
 
 func TestUnlinkLdapGroup(t *testing.T) {
+	mainHelper.Parallel(t)
 	const entryUUID string = "foo"
 
 	th := Setup(t)
@@ -220,6 +225,7 @@ func TestUnlinkLdapGroup(t *testing.T) {
 }
 
 func TestMigrateIdLdap(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -239,6 +245,7 @@ func TestMigrateIdLdap(t *testing.T) {
 }
 
 func TestUploadPublicCertificate(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -260,6 +267,7 @@ func TestUploadPublicCertificate(t *testing.T) {
 }
 
 func TestUploadPrivateCertificate(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -281,6 +289,7 @@ func TestUploadPrivateCertificate(t *testing.T) {
 }
 
 func TestAddUserToGroupSyncables(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()