roachtest: stage_failure failed

**Note:** This build has runtime assertions enabled. If the same failure was hit in a run without assertions enabled, there should be a similar failure without this message. If there isn't one, then this failure is likely due to an assertion violation or (assertion) timeout.

roachtest.stage_failure [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/20992907?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/20992907?buildTab=artifacts#/decommission/mixed-versions) on release-25.4.3-rc @ [71d853623f0d1f589fd5c727a1c4aec8a43e62e0](https://github.com/cockroachdb/cockroach/commits/71d853623f0d1f589fd5c727a1c4aec8a43e62e0):

```
test decommission/mixed-versions failed: (mixedversion.go:891).Run: mixed-version test failure while running step 15 (restart node 4 with binary version v24.3.4): cluster.Stage: output:
curl: (92) HTTP/2 stream 0 was not closed cleanly: INTERNAL_ERROR (err 2)
gzip: stdin: unexpected end of file
tar: Unexpected EOF in archive
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now: TRANSIENT_ERROR(stage_failure): COMMAND_PROBLEM: exit status 2
test artifacts and logs in: /artifacts/decommission/mixed-versions/run_1
```

Parameters:
- arch=amd64
- cloud=gce
- coverageBuild=false
- cpu=4
- encrypted=false
- mvtDeploymentMode=shared-process
- mvtVersions=v24.1.10 → v24.3.4 → v25.2.0 → release-25.4.3-rc
- runtimeAssertionsBuild=true
- ssd=0
Help

See: [roachtest README](https://github.com/cockroachdb/cockroach/blob/master/pkg/cmd/roachtest/README.md)

See: [How To Investigate \(internal\)](https://cockroachlabs.atlassian.net/l/c/SSSBr8c7)

See: [Grafana](https://go.crdb.dev/roachtest-grafana/teamcity-20992907/decommission-mixed-versions/1768633579913/1768633970251)

Same failure on other branches

- #154115 roachtest: stage_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4]
- #151910 roachtest: stage_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3]
- #146357 roachtest: stage_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.3]
- #146037 roachtest: stage_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.0-rc]
- #140132 roachtest: stage_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.1]
- #123276 roachtest: stage_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-23.2]
- #123193 roachtest: stage_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #123047 roachtest: stage_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.1]

/cc @cockroachdb/test-eng

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Jira issue: CRDB-58801