Rework deletion e2e to use pluggable client interface to verify content is actually gone

[ncdc]

See https://github.com/kcp-dev/kcp/pull/989#discussion_r866124843

"Pluggable client interface" so we can support both etcd and cockroachdb

[stevekuznetsov]

This has ... obvious drawbacks. :^)

[ncdc]

Updated to include crdb

[kcp-ci-bot]

Issues go stale after 90d of inactivity. After a furter 30 days, they will turn rotten. Mark the issue as fresh with /remove-lifecycle stale.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[kcp-ci-bot]

Stale issues rot after 30d of inactivity. Mark the issue as fresh with /remove-lifecycle rotten. Rotten issues close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

/lifecycle rotten

[kcp-ci-bot]

Rotten issues close after 30d of inactivity. Reopen the issue with /reopen. Mark the issue as fresh with /remove-lifecycle rotten.

/close

[kcp-ci-bot]

@kcp-ci-bot: Closing this issue.

In response to this:

Rotten issues close after 30d of inactivity. Reopen the issue with /reopen. Mark the issue as fresh with /remove-lifecycle rotten.

/close

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