align the python script for releasing with 8.14 (#12437)

Also update the failed build checking.

scripts/GenerateBuildTestAndStagingReport.py

         return createTableRow(traffic_light.format(color="black"), "Test status: unable to retrieve status of tests")
     else:
         test_failures_json = test_failures_request.json()
-        if test_failures_json["count"] == 0:
+        # nowadays the responds doesn't contain count keyword when the build is successful
+        # while count word can be found when build fails
+        if "count" not in test_failures_json:
             return createTableRow(traffic_light.format(color="green"), "Test status: all tests passing")
         else:
             return createTableRow(traffic_light.format(color="red"), "Test status: there are " + str(test_failures_json["count"]) + " failing tests, <a href={}>check the build report</a>".format(buildResultUrl))

scripts/GeneratePostPublishReport.py

 	if archetype_metadata_request.status_code != 200:
 		return createTableRow(traffic_light.format(color="black"), "Check archetype metadata: <a href='{url}'>unable to retrieve metadata from {url}</a>".format(url=archetypeMetadataUrl))
 	else:
-		if "version=\"{version}\"".format(version=version) in archetype_metadata_request.content:
+		if "version=\"{version}\"".format(version=version) in archetype_metadata_request.text:
 			return createTableRow(traffic_light.format(color="green"), "Check archetype metadata: <a href='{url}'>metadata is correct for {url}</a>".format(url=archetypeMetadataUrl))
 		else:
 			return createTableRow(traffic_light.format(color="red"), "Check archetype metadata: <a href='{url}'>metadata seems to be incorrect for {url}</a>".format(url=archetypeMetadataUrl))
 
 content += "</table></body></html>"
 
-with open("result/report.html", "wb") as f:
+with open("result/report.html", "w") as f:
 	f.write(content)