Switched to using Mariner's `python-junit-xml`. (#6814)

.pipelines/templates/PackageBuild.yml

@@ -258,5 +258,4 @@ steps:
           failOnTestFailures: ${{ parameters.failOnTestFailures }}
           outputArtifactsFolder: ${{ parameters.outputArtifactsFolder }}
           outputArtifactsTestsSubfolder: ${{ parameters.outputArtifactsTestsSubfolder }}
-          pipArtifactFeeds: ${{ parameters.pipArtifactFeeds }}
           testSuiteName: ${{ parameters.testSuiteName }}

.pipelines/templates/PackageTestResultsAnalysis.yml

@@ -18,10 +18,6 @@ parameters:
     type: string
     default: "TESTS"
 
-  - name: pipArtifactFeeds
-    type: string
-    default: ""
-
   - name: testSuiteName
     type: string
     default: "Package test"
@@ -36,13 +32,7 @@ parameters:
     default: "$(Agent.TempDirectory)"
 
 steps:
-  - ${{ if parameters.pipArtifactFeeds }}:
-      - task: PipAuthenticate@1
-        inputs:
-          artifactFeeds: "${{ parameters.pipArtifactFeeds }}"
-        displayName: "Authenticate to custom pip artifact feeds"
-
-  - bash: pip3 install junit_xml
+  - bash: tdnf install -y python3-junit-xml
     retryCountOnTaskFailure: 3
     displayName: "Install Python dependencies"