release-22.2: batcheval: delete flaky integration test

[nvanbenschoten]

Backport 1/1 commits from #106502.

/cc @cockroachdb/release

Closes #111261.

---

TestLeaseCommandLearnerReplica is fundamentally flaky as commit can't retry all underlying replication failures and acceptable failure causes are not exposed on the higher levels where test operates.

What test is supposed to verify that failures to propose with invalid lease are not causing pipelined writes to fail but are retried. More details described in original PR #35261 where this test is introduced.
In absence of direct controls of that, test is trying to move leases between replicas, but this action could cause different failures to happen which can't be filtered out. For example:
failed to repropose 0b9a11f4bef0e3d3 at idx 16 with new lease index: [NotLeaseHolderError] ‹reproposal failed due to closed timestamp›
and
stale proposal: command was proposed under lease #2 but is being applied under lease: ...
While closed timestamp could be mitigated by changing settings, second one is opaque to the caller and hard to filter out.

Release note: None
Fixes #104716

Release justification: deletes flaky test.

[blathers-crl]

Thanks for opening a backport.

Please check the backport criteria before merging:

• Patches should only be created for serious issues or test-only changes.
• Patches should not break backwards-compatibility.
• Patches should change as little code as possible.
• Patches should not change on-disk formats or node communication protocols.
• Patches should not add new functionality.
• Patches must not add, edit, or otherwise modify cluster versions; or add version gates.

If some of the basic criteria cannot be satisfied, ensure that the exceptional criteria are satisfied within.

• There is a high priority need for the functionality that cannot wait until the next release and is difficult to address in another way.
• The new functionality is additive-only and only runs for clusters which have specifically “opted in” to it (e.g. by a cluster setting).
• New code is protected by a conditional check that is trivial to verify and ensures that it only runs for opt-in clusters.
• The PM and TL on the team that owns the changed code have signed off that the change obeys the above rules.

Add a brief release justification to the body of your PR to justify this backport.

Some other things to consider:

• What did we do to ensure that a user that doesn’t know & care about this backport, has no idea that it happened?
• Will this work in a cluster of mixed patch versions? Did we test that?
• If a user upgrades a patch version, uses this feature, and then downgrades, what happens?

[cockroach-teamcity]

This change is