[WIP] Add test for GIT_SSL_CAINFO env var removal

[karlkfi]

This confirms that the new SSA used to update the reconciler Deployment correctly deletes the GIT_SSL_CAINFO env var (as long as no one else has modified it).

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[karlkfi]

Gonna wait to merge this until @sdowell adds support for http access to git. That way we won't pollute the CACertSecretRef test with needing to use NoSSLVerify (which has its own test).

[sdowell]

@karlkfi This should add support for HTTP, although I'm still not sure whether it's needed https://github.com/GoogleContainerTools/kpt-config-sync/pull/316

[mikebz]

curious if this is still WIP or if it's even relevant. If it is consider closing the PR and keeping the private branch or converting to draft.