Test cache for multi operation TXN

[serathius]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[serathius]

/test pull-etcd-unit-test-amd64

[serathius]

--- PASS: TestWatchWithoutCache (0.16s)
    --- PASS: TestWatchWithoutCache/Watch_all_events (0.20s)

--- FAIL: TestWatchWithCache (0.45s)
    cache_test.go:108: Open test watchers
    cache_test.go:113: Setup data
    cache_test.go:126: Validate
    --- FAIL: TestWatchWithCache/Watch_all_events (0.20s)
        cache_test.go:133: unexpected events (-want +got):
              []*clientv3.Event{
                ... // 2 identical elements
                &{Type: s"DELETE", Kv: &{Key: "/a", ModRevision: 4}},
                &{Kv: &{Key: "/a", CreateRevision: 5, ModRevision: 5, Version: 1, ...}},
            -   &{Type: s"DELETE", Kv: s`key:"/b" mod_revision:5 `},
              }

[k8s-ci-robot]

@serathius: The following test 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-etcd-unit-test-amd64	47542bc	link	true	/test pull-etcd-unit-test-amd64

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-ci-robot]

PR needs rebase.

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