Merge setting.InitXXX into one function with options (#24389)

This PR will merge 3 Init functions on setting packages as 1 and
introduce an options struct.

models/issues/main_test.go

@@ -9,7 +9,6 @@ import (
 
 	issues_model "code.gitea.io/gitea/models/issues"
 	"code.gitea.io/gitea/models/unittest"
-	"code.gitea.io/gitea/modules/setting"
 
 	_ "code.gitea.io/gitea/models"
 	_ "code.gitea.io/gitea/models/repo"
@@ -18,11 +17,6 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func init() {
-	setting.SetCustomPathAndConf("", "", "")
-	setting.InitProviderAndLoadCommonSettingsForTest()
-}
-
 func TestFixturesAreConsistent(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())
 	unittest.CheckConsistencyFor(t,