Format convert failure information collated

The output of the collate subcommand was not user friendly and it didn't work also due to a syntax error. With this change we recover this funtionality and provide usefull information to the user.

This is part of the issue 41 to provide a expectations update patch from any pipeline.

ci-uprev.py

@@ -48,6 +48,7 @@ from gitlab import GitlabGetError, GitlabUpdateError
 from gitlab.v4.objects import (Project, ProjectBranch, ProjectCommit,
                                ProjectIssue, ProjectJob, ProjectMergeRequest,
                                ProjectNote, ProjectPipeline, ProjectPipelineJob)
+import json
 from pprint import pformat
 from tenacity import retry, stop_after_attempt, wait_exponential
 from uprev_exceptions import NothingToUprev
@@ -91,6 +92,10 @@ class UpdateRevision(Enum):
 uprev_pair: UpdateRevision
 
 
+def defaultdictdeque() -> defaultdict:
+    return defaultdict(deque)
+
+
 def prepare_environment(
         default_target_namespace: str = 'virgl',
         default_target: str = 'virglrenderer',
@@ -740,10 +745,6 @@ def collate_results(
     :return: failures, artifacts, without_artifacts
     """
     print(f"Looking for failed jobs in pipeline {pipeline.web_url}")
-
-    def defaultdictdeque() -> defaultdict:
-        return defaultdict(deque)
-
     if artifacts is None:
         artifacts = dict()
     if failures is None:
@@ -802,7 +803,7 @@ def __is_fundamental_job(
 
 def __classify_the_job(
         job: ProjectJob
-        ) -> str | Tuple:
+        ) -> Union[str, Tuple]:
     """
     Different uprev would have different ways to classify jobs. So we would
     specialize this method depending on the pair to uprev.
@@ -850,8 +851,7 @@ def __download_artifacts(
         return True
     except Exception as outer_exception:
         print(f"An exception ({type(outer_exception)}) occurred "
-              f"when downloading results for '{job.name}' "
-              f"from '{failures_path}' at {job.web_url}: "
+              f"when downloading results for '{job.name}' at {job.web_url}: "
               f"{outer_exception}!")
         return False
 
@@ -1523,7 +1523,14 @@ def __cmd_collate_results(
         print(f"These jobs failed to produce artifacts: "
               f"{', '.join(job_names)}")
     if failures:
-        print(f"Failures:\n{pformat(failures)}")
+        copy_failures = defaultdict(defaultdict)
+        for job in failures:
+            for test in failures[job]:
+                # remove the deque
+                copy_failures[str(job)][test] = list(failures[job][test])
+        # remove the defaultdict
+        copy_failures = json.loads(json.dumps(copy_failures))
+        print(f"Failures:\n{pformat(copy_failures)}")
 
 
 def __cmd_retry_pipeline(