docs/devel: Split testing docs from the build docs and move to separate folder

Building and testing are two separate topics, so let's split the testing
into a separate category and move the related

docs/devel: Split testing docs from the build docs and move to separate folder

Building and testing are two separate topics, so let's split the testing
into a separate category and move the related files into a separate folder.

Message-ID: <20240830133841.142644-42-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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