[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/file_test.go

@@ -30,6 +30,7 @@ import (
 )
 
 func TestGeneratePublicLinkHash(t *testing.T) {
+	mainHelper.Parallel(t)
 	filename1 := model.NewId() + "/" + model.NewRandomString(16) + ".txt"
 	filename2 := model.NewId() + "/" + model.NewRandomString(16) + ".txt"
 	salt1 := model.NewRandomString(32)
@@ -48,6 +49,7 @@ func TestGeneratePublicLinkHash(t *testing.T) {
 }
 
 func TestDoUploadFile(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -109,6 +111,7 @@ func TestDoUploadFile(t *testing.T) {
 }
 
 func TestUploadFile(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -137,6 +140,7 @@ func TestUploadFile(t *testing.T) {
 }
 
 func TestParseOldFilenames(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -234,6 +238,7 @@ func TestParseOldFilenames(t *testing.T) {
 }
 
 func TestGetInfoForFilename(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -245,6 +250,7 @@ func TestGetInfoForFilename(t *testing.T) {
 }
 
 func TestFindTeamIdForFilename(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -259,6 +265,7 @@ func TestFindTeamIdForFilename(t *testing.T) {
 }
 
 func TestMigrateFilenamesToFileInfos(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -293,6 +300,7 @@ func TestMigrateFilenamesToFileInfos(t *testing.T) {
 }
 
 func TestCreateZipFileAndAddFiles(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -349,6 +357,7 @@ func TestCreateZipFileAndAddFiles(t *testing.T) {
 }
 
 func TestCopyFileInfos(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t)
 	defer th.TearDown()
 
@@ -380,6 +389,7 @@ func TestCopyFileInfos(t *testing.T) {
 }
 
 func TestGenerateThumbnailImage(t *testing.T) {
+	mainHelper.Parallel(t)
 	t.Run("test generating thumbnail image", func(t *testing.T) {
 		// given
 		th := Setup(t)
@@ -409,6 +419,7 @@ func createDummyImage() *image.RGBA {
 }
 
 func TestSearchFilesInTeamForUser(t *testing.T) {
+	mainHelper.Parallel(t)
 	perPage := 5
 	searchTerm := "searchTerm"
 
@@ -602,6 +613,7 @@ func TestSearchFilesInTeamForUser(t *testing.T) {
 }
 
 func TestExtractContentFromFileInfo(t *testing.T) {
+	mainHelper.Parallel(t)
 	app := &App{}
 	fi := &model.FileInfo{
 		MimeType: "image/jpeg",
@@ -612,6 +624,7 @@ func TestExtractContentFromFileInfo(t *testing.T) {
 }
 
 func TestGetLastAccessibleFileTime(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := SetupWithStoreMock(t)
 	defer th.TearDown()
 
@@ -645,6 +658,7 @@ func TestGetLastAccessibleFileTime(t *testing.T) {
 }
 
 func TestComputeLastAccessibleFileTime(t *testing.T) {
+	mainHelper.Parallel(t)
 	t.Run("Updates the time, if cloud limit is applicable", func(t *testing.T) {
 		th := SetupWithStoreMock(t)
 		defer th.TearDown()
@@ -704,6 +718,7 @@ func TestComputeLastAccessibleFileTime(t *testing.T) {
 }
 
 func TestSetFileSearchableContent(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
@@ -732,6 +747,7 @@ func TestSetFileSearchableContent(t *testing.T) {
 }
 
 func TestPermanentDeleteFilesByPost(t *testing.T) {
+	mainHelper.Parallel(t)
 	th := Setup(t).InitBasic()
 	defer th.TearDown()