The Junit reports should always be uploaded

Without specifying `when:always` the junit reports
will only be uploaded if the job succeeds.
While this is documented behaviour, this causes confusion for
some users. As a simple solution we can just change the provided
examples to already include the relevant line.

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/215901

doc/ci/unit_test_reports.md

@@ -97,6 +97,7 @@ ruby:
     - bundle install
     - bundle exec rspec --format progress --format RspecJunitFormatter --out rspec.xml
   artifacts:
+    when: always
     paths:
       - rspec.xml
     reports:
@@ -116,6 +117,7 @@ golang:
     - go get -u github.com/jstemmer/go-junit-report
     - go test -v 2>&1 | go-junit-report -set-exit-code > report.xml
   artifacts:
+    when: always
     reports:
       junit: report.xml
 ```
@@ -137,6 +139,7 @@ java:
   script:
     - gradle test
   artifacts:
+    when: always
     reports:
       junit: build/test-results/test/**/TEST-*.xml
 ```
@@ -156,6 +159,7 @@ java:
   script:
     - mvn verify
   artifacts:
+    when: always
     reports:
       junit:
         - target/surefire-reports/TEST-*.xml
@@ -173,6 +177,7 @@ pytest:
   script:
     - pytest --junitxml=report.xml
   artifacts:
+    when: always
     reports:
       junit: report.xml
 ```
@@ -194,6 +199,7 @@ cpp:
   script:
     - gtest.exe --gtest_output="xml:report.xml"
   artifacts:
+    when: always
     reports:
       junit: report.xml
 ```
@@ -208,6 +214,7 @@ cunit:
   script:
     - ./my-cunit-test
   artifacts:
+    when: always
     reports:
       junit: ./my-cunit-test.xml
 ```