Move `/lib/test` taglib here from core

I noticed a taglib in core sources https://github.com/jenkinsci/jenkins/blob/e7b46e917cef7273638a4c00cbfa88911c305a19/core/src/main/resources/lib/test/bar.jelly#L26 apparently forgotten during the `junit` plugin split. https://github.com/search?q=org%3Ajenkinsci+%22%2Flib%2Ftest%22&type=code shows it being used here from core https://github.com/jenkinsci/junit-plugin/blob/000693f1f36ea33a48a974d330f718cebf7044d3/src/main/resources/hudson/tasks/test/TestResult/index.jelly#L26-L34 yet it is also used in various other plugins like
* https://github.com/jenkinsci/maven-invoker-plugin/blob/58143debdef9bb58ea5c6c749b6944666d8b7e47/src/main/resources/org/jenkinsci/plugins/maveninvoker/MavenInvokerBuildAction/index.jelly#L30
* https://github.com/jenkinsci/multi-module-tests-publisher-plugin/blob/c613ef3241c454e18854b0a3abdde9b53b63167a/src/main/resources/com/cwctravel/hudson/plugins/multimoduletests/junit/ProjectResult/index.jelly#L32
* https://github.com/jenkinsci/tikal-multijob-plugin/blob/ca37a7c2778ef3598c651345c4dab82dd9c08445/src/main/resources/com/tikal/jenkins/plugins/multijob/MultiJobTestResults/index.jelly#L58
* https://github.com/jenkinsci/matrix-project-plugin/blob/06b7f47bc631d63212a680231b6979e4e61da7ee/src/main/resources/hudson/tasks/test/MatrixTestResult/index.jelly#L31
* https://github.com/jenkinsci/javatest-report-plugin/blob/5b703049afb8b6c7bbf970df8fd4936527356337/src/main/resources/hudson/plugins/javatest_report/TestCollection/index.jelly#L12
* https://github.com/jenkinsci/labeled-test-groups-publisher-plugin/blob/f2a89993ac8a4e0e5fd7c45ba5c313df12ebf8f4/src/main/resources/hudson/plugins/labeledgroupedtests/LabeledTestResultGroup/index.jelly#L32

as well as some taglib imports not apparently used like

* https://github.com/jenkinsci/tap-plugin/blob/431c6713253c95f2536e312b81ba698fe51913ae/src/main/resources/org/tap4j/plugin/model/TapTestResultResult/index.jelly#L26

Not to be confused with https://github.com/jenkinsci/junit-plugin/blob/000693f1f36ea33a48a974d330f718cebf7044d3/src/main/resources/lib/hudson/test which _was_ moved during the split.

Start with core/src/main/resources/lib/test/bar.jelly and the corresponding resources/lib/test path in the junit plugin, then inspect the listed plugin usages and imports. Done means the taglib is relocated without breaking the referenced Jelly views or leaving the core copy as the provider.

Written by the indexing model from the issue text.