roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/20427992?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/20427992?buildTab=artifacts#/kv0/enc=false/nodes=1/size=64kb/conc=4096) on release-25.2.6-rc @ [68a653b3beb1e27f57567347652e3933808f076f](https://github.com/cockroachdb/cockroach/commits/68a653b3beb1e27f57567347652e3933808f076f):

```
test kv0/enc=false/nodes=1/size=64kb/conc=4096 failed: (test_runner.go:840).func4: in provider: aws: failed to run: aws ec2 run-instances --associate-public-ip-address --count 1 --instance-type m7gd.2xlarge --image-id ami-05983a09f7dc1c18f --key-name teamcity-runner-Y22Ql8C-cCl0wEef6I2SDwF3EIM= --region us-east-2 --security-group-ids sg-04d72b57e29d671f1 --subnet-id subnet-0258dc9d1b6473d84 --tag-specifications ResourceType=instance,Tags=[{Key=roachtest-branch,Value=release-25-2-6-rc},{Key=usage,Value=roachtest},{Key=Name,Value=teamcity-20427992-1756964486-20-n2cpu8-0001},{Key=Cluster,Value=teamcity-20427992-1756964486-20-n2cpu8},{Key=spot,Value=true},{Key=roachprod,Value=true},{Key=cluster,Value=teamcity-20427992-1756964486-20-n2cpu8},{Key=lifetime,Value=12h0m0s},{Key=arch,Value=arm64},{Key=created,Value=2025-09-04T06:03:31Z}] ResourceType=volume,Tags=[{Key=roachtest-branch,Value=release-25-2-6-rc},{Key=usage,Value=roachtest},{Key=Name,Value=teamcity-20427992-1756964486-20-n2cpu8-0001},{Key=Cluster,Value=teamcity-20427992-1756964486-20-n2cpu8},{Key=spot,Value=true},{Key=roachprod,Value=true},{Key=cluster,Value=teamcity-20427992-1756964486-20-n2cpu8},{Key=lifetime,Value=12h0m0s},{Key=arch,Value=arm64},{Key=created,Value=2025-09-04T06:03:31Z}] --user-data file:///tmp/aws-startup-script684781876 --iam-instance-profile Name=roachprod-testing --block-device-mapping file:///tmp/aws-block-device-mapping3516969469 --instance-market-options MarketType=spot,SpotOptions={SpotInstanceType=one-time,InstanceInterruptionBehavior=terminate} --output json: stderr:
An error occurred (InsufficientInstanceCapacity) when calling the RunInstances operation (reached max retries: 2): There is no Spot capacity available that matches your request.: exit status 254 [owner=test-eng]
```

Parameters:
- cloud=aws
- coverageBuild=false
- cpu=8
- runtimeAssertionsBuild=false
- 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)

Same failure on other branches

- #152952 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.3.20-rc]
- #152844 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3]
- #152504 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3]
- #152503 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3]
- #152502 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3]
- #152501 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3]
- #151853 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3.1-rc]
- #151736 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.3.19-rc]
- #151734 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2]
- #151731 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.3]

/cc @cockroachdb/test-eng

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

Jira issue: CRDB-54123