release-26.3: sql: TestExperimentalRelocateNonVoters failed

sql.TestExperimentalRelocateNonVoters [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Ci_TestsAwsLinuxArm64_UnitTests/21463748?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Ci_TestsAwsLinuxArm64_UnitTests/21463748?buildTab=artifacts#/) on release-26.3 @ [c9dc26cc0470c63f048daebb15f851dc1873cc47](https://github.com/cockroachdb/cockroach/commits/c9dc26cc0470c63f048daebb15f851dc1873cc47):

```
=== RUN TestExperimentalRelocateNonVoters
test_log_scope.go:172: test logs captured to: /artifacts/tmp/_tmp/492cc08314ebb30515b6f60e383090f4/logTestExperimentalRelocateNonVoters2361112514
test_log_scope.go:82: use -show-logs to present logs inline
multitenant_admin_function_test.go:1006: -- test log scope end --
test logs left over in: /artifacts/tmp/_tmp/492cc08314ebb30515b6f60e383090f4/logTestExperimentalRelocateNonVoters2361112514
--- FAIL: TestExperimentalRelocateNonVoters (59.82s)
=== RUN TestExperimentalRelocateNonVoters/ALTER_TABLE_x_EXPERIMENTAL_RELOCATE_NONVOTERS
multitenant_admin_function_test.go:186: condition failed to evaluate within 45s: from multitenant_admin_function_test.go:194: waiting for 1 ranges with LEARNER replicas to clear

goroutine dump: /artifacts/tmp/_tmp/492cc08314ebb30515b6f60e383090f4/goroutine_dump_2476573166.txt
--- FAIL: TestExperimentalRelocateNonVoters/ALTER_TABLE_x_EXPERIMENTAL_RELOCATE_NONVOTERS (59.81s)
```
Help

See also: [How To Investigate a Go Test Failure \(internal\)](https://cockroachlabs.atlassian.net/l/c/HgfXfJgM)

/cc @cockroachlabs/sql-foundations

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Jira issue: CRDB-66657