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Remove outdated tests
The git client plugin no longer needs to support command line git older than 2.11 because all the operating systems supoprted by Jenkins include command line git 2.11 or newer. No need for conditionals to check for older versions.
The command line git versions supported by the git client plugin all include symref functionality. No need to test for support of symref, since all supported versions of command line git include it.
https://www.jenkins.io/blog/2023/05/30/operating-system-end-of-life/ is the May 2023 blog post that announced the end of life for RHEL 7 and its derivatives.
Checklist
Types of changes
What types of changes does your code introduce?