[MM-41576] Revamp database schema version (#19586)

* revamp db version and add applied migrations endpoint

* replace old schema version with new

* add db version subcommand

* add to local api

* reflect review comments

* log errors

* remove setting the version from model.CurrentVersion

* fix a test

app/server_test.go

@@ -235,7 +235,7 @@ func TestDatabaseTypeAndMattermostVersion(t *testing.T) {
 
 	databaseType, mattermostVersion := th.Server.DatabaseTypeAndMattermostVersion()
 	assert.Equal(t, "postgres", databaseType)
-	assert.Equal(t, "5.31.0", mattermostVersion)
+	assert.GreaterOrEqual(t, mattermostVersion, strconv.Itoa(1))
 
 	os.Setenv("MM_SQLSETTINGS_DRIVERNAME", "mysql")
 
@@ -244,7 +244,7 @@ func TestDatabaseTypeAndMattermostVersion(t *testing.T) {
 
 	databaseType, mattermostVersion = th2.Server.DatabaseTypeAndMattermostVersion()
 	assert.Equal(t, "mysql", databaseType)
-	assert.Equal(t, "5.31.0", mattermostVersion)
+	assert.GreaterOrEqual(t, mattermostVersion, strconv.Itoa(1))
 }
 
 func TestGenerateSupportPacket(t *testing.T) {