Add skipped to the message for skipped tests in human reports

[mrodm]

Currently, if there are skipped tests (e.g. system or pipeline tests), there is no reference in the output about that test is skipped:

--- Test results for package: elastic_package_registry - START --- ╭──────────────────────────┬─────────────┬───────────┬───────────┬─────────────────────────────────────────────────────────────┬──────────────╮ │ PACKAGE │ DATA STREAM │ TEST TYPE │ TEST NAME │ RESULT │ TIME ELAPSED │ ├──────────────────────────┼─────────────┼───────────┼───────────┼─────────────────────────────────────────────────────────────┼──────────────┤ │ elastic_package_registry │ metrics │ system │ default │ test [https://github.com/elastic/integrations/issues/10904] │ 30.268µs │ ╰──────────────────────────┴─────────────┴───────────┴───────────┴─────────────────────────────────────────────────────────────┴──────────────╯ --- Test results for package: elastic_package_registry - END --- 

This PR adds SKIPPED: to the message with the reason and link. Example:

--- Test results for package: elastic_package_registry - START --- ╭──────────────────────────┬─────────────┬───────────┬───────────┬──────────────────────────────────────────────────────────────────────┬──────────────╮ │ PACKAGE │ DATA STREAM │ TEST TYPE │ TEST NAME │ RESULT │ TIME ELAPSED │ ├──────────────────────────┼─────────────┼───────────┼───────────┼──────────────────────────────────────────────────────────────────────┼──────────────┤ │ elastic_package_registry │ metrics │ system │ default │ SKIPPED: test [https://github.com/elastic/integrations/issues/10904] │ 13.583µs │ ╰──────────────────────────┴─────────────┴───────────┴───────────┴──────────────────────────────────────────────────────────────────────┴──────────────╯ --- Test results for package: elastic_package_registry - END --- 

This does not change the XML output (xUnit):

<?xml version="1.0" encoding="UTF-8"?> <testsuites> <testsuite name="system" tests="1" skipped="1"> <!--test suite for system tests--> <testcase name="system test: default" classname="elastic_package_registry.metrics" time="1.708e-05"> <skipped message="test [https://github.com/elastic/integrations/issues/10904]"></skipped> </testcase> </testsuite> </testsuites> 

[elasticmachine]

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cc @mrodm