Expose underlying server struct

[ntnn]

Summary

See #3420

What Type of PR Is This?

/kind feature

Related Issue(s)

Fixes #3420

Release Notes

Expose underlying server struct in testing framework if the runner supports it

[kcp-ci-bot]

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[kcp-ci-bot]

@ntnn: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kcp-verify	b01c022	link	true	/test pull-kcp-verify
pull-kcp-verify-codegen	b01c022	link	true	/test pull-kcp-verify-codegen
pull-kcp-test-integration	b01c022	link	true	/test pull-kcp-test-integration
pull-kcp-test-unit	b01c022	link	true	/test pull-kcp-test-unit
pull-kcp-lint	b01c022	link	true	/test pull-kcp-lint
pull-kcp-test-e2e-sharded	b01c022	link	true	/test pull-kcp-test-e2e-sharded

Full PR test history

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[kcp-ci-bot]

PR needs rebase.

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