cache: Disable caching for clones

Whilst the cache feature is useful for content that the web browser will
see, it is less useful when cgit is asked to clone a repository. Users
might end up with a tree that is ever so slightly out of date.

An upcoming commit will introduce functionality to offload clones to
git-http-backend(1). The cache feature will prevent this from working
correctly.

Therefore, disable cache processing for commands that have the is_clone
flag set.

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