roachtest: stage_failure failed

roachtest.stage_failure [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyGcePrivateBazel/21499468?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyGcePrivateBazel/21499468?buildTab=artifacts#/c2c/mixed-version) on release-25.2.24-rc @ [92c7311721160180bed1228023264f6df947fc1e](https://github.com/cockroachdb/cockroach/commits/92c7311721160180bed1228023264f6df947fc1e):

```
test c2c/mixed-version failed: (mixedversion.go:810).Run: source: mixed-version test failure while running step 2 (start cluster at version "v25.1.10"): cluster.Stage: output:
1:
2:
3:
4: COMMAND_PROBLEM: exit status 2
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 [owner=test-eng]
(mixedversion.go:810).Run: dest: context canceled [owner=test-eng]
test artifacts and logs in: /artifacts/c2c/mixed-version/run_1
```

Parameters:
- arch=amd64
- cloud=gce
- coverageBuild=false
- cpu=16
- diskCount=0
- encrypted=false
- fs=ext4
- localSSD=true
- metamorphicBufferedSender=false
- mvtDeploymentMode=system-only
- mvtVersions=v25.1.10 → release-25.2.24-rc
- runtimeAssertionsBuild=false
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-21499468/c2c-mixed-version/1788541892022/1788542132071)

Same failure on other branches

- #169514 roachtest: stage_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.10-rc]
- #161334 roachtest: stage_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.3-rc]
- #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 @cockroachlabs/test-eng

[This test on roachdash](https://roachdash.crdb.dev/?filter=status:open%20t:.*stage_failure.*&sort=title+created&display=lastcommented+project) | [Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Start with the roachtest README and the mixedversion.go:810 failure path, then inspect the linked TeamCity artifacts under /artifacts/c2c/mixed-version/run_1. Investigate the HTTP/2 curl error and truncated gzip archive during step 2 of c2c/mixed-version; done means the mixed-version test can start the v25.1.10 cluster without stage_failure.

Written by the indexing model from the issue text.