Aasim/release1.23/importfixes (#12721)

* Fixing import getting stuck on step 4  (#12677)

* Getting the proper attribute during column modification
Exposing errors of change column settings and stopping import if they occur

* removing extra space

* Added a comment for error handling

* Fixed a test error that was caused due to insufficient null checks.

* removing unnecessary return

* version bump of flat file services (#12686)

extensions/import/config.json

@@ -1,7 +1,7 @@
 {
 	"downloadUrl": "https://sqlopsextensions.blob.core.windows.net/extensions/import/service/{#version#}/{#fileName#}",
 	"useDefaultLinuxRuntime": true,
-	"version": "0.0.5",
+	"version": "0.0.6",
 	"downloadFileNames": {
 		"Windows_64": "win-x64.zip",
 		"Windows_86": "win-x86.zip",