[AUTO-CHERRYPICK] [3.0] Added a workaround for PR checks from forked repos. - branch 3.0-dev (microsoft#14255)

Co-authored-by: Pawel Winogrodzki <[email protected]>
Co-authored-by: aaruag <[email protected]>

Author: 3 people

.pipelines/templates/PackageTestResultsAnalysis.yml

@@ -32,7 +32,8 @@ parameters:
     default: "$(Agent.TempDirectory)"
 
 steps:
-  - bash: pip3 install --user junit_xml==1.9
+    # TODO: the "--index-url" argument must be removed once accessing internal ADO feeds from fork PR checks is supported.
+  - bash: pip3 install --user junit_xml==1.9 --index-url https://pypi.org/simple
     retryCountOnTaskFailure: 3
     displayName: "Install Python dependencies"