CASMTRIAGE-6231 1.6 : Goss etcd cluster balance test timed out

[kimjensen-hpe]

Summary and Scope

Increases timeout - needed now that SPC is installed on the system

Issues and Related PRs

List and characterize relationship to Jira/Github issues and other pull requests. Be sure to list dependencies.

• Resolves CASMTRIAGE-6231
• Change will also be needed in <insert branch name here>
• Future work required by [issue id](issue link)
• Documentation changes required in [issue id](issue link)
• Merge with/before/after <insert PR URL here>

Testing

Tested on:

• spice

Test description:

When the timeout is changed to 30s, the test passes

 # GOSS_BASE=/opt/cray/tests/install/ncn goss -g /opt/cray/tests/install/ncn/tests/goss-k8s-etcd-cluster-balance.yaml v
..

Total Duration: 21.353s
Count: 2, Failed: 0, Skipped: 0```

_How were the changes tested and success verified? If schema changes were part of this change, how were those handled in your upgrade/downgrade testing?_

- Were the install/upgrade-based validation checks/tests run (goss tests/install-validation doc)?
- Were continuous integration tests run? If not, why?
- Was upgrade tested? If not, why?
- Was downgrade tested? If not, why?
- Were new tests (or test issues/Jiras) created for this change?

## Risks and Mitigations

_Are there known issues with these changes? Any other special considerations?_


## Pull Request Checklist

- [ ] Version number(s) incremented, if applicable
- [ ] Copyrights updated
- [ ] License file intact
- [x] Target branch correct
- [ ] CHANGELOG.md updated
- [x] Testing is appropriate and complete, if applicable
- [ ] [HPC Product Announcement](https://cray.slack.com/archives/C026TVCSXLH) prepared, if applicable

[kimjensen-hpe]

/backport release/1.5

[github-actions]

Backporting into branch release/1.5 was successful. New PR: #554