[backcompat-tests] Remove tests against older webserver than code server #24576
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Summary & Motivation
Removes backcompat tests that use an older webserver version that code server version. We explicitly state that we do not support this in our docs.
How I Tested These Changes
Modified backcompat test suite.
Changelog
NOCHANGELOG
NEW(added new feature or capability)BUGFIX(fixed a bug)DOCS(added or updated documentation)