Adds a new plugin to the e2e plugins that simulates an older
plugin binary and a test suite to ensure older plugin binaries
keep behaving the same with newer CLI versions.
Signed-off-by: Laura Brehm <laurabrehm@hey.com>
(cherry picked from commit cfa9fef77d)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
