fix(cli): silence debug output from retryablehttp package

[emosbaugh]

What this PR does / why we need it:

Silence debug output from github.com/hashicorp/go-retryablehttp http client

# ./kots install qakotsregression/type-existing-cluster-env-airg
2025/08/05 01:37:08 [DEBUG] POST https://replicated.app/kots_metrics/start_install/30qb0gCPO3G48BKqjdAhCCRPumi
Enter the namespace to deploy to: qakotsregression
2025/08/05 01:37:09 [DEBUG] GET https://replicated.app/metadata/qakotsregression/type-existing-cluster-env-airg?
2025/08/05 01:37:09 [DEBUG] GET https://replicated.app/branding/qakotsregression/type-existing-cluster-env-airg?
  • Deploying Admin Console
    • Creating namespace ✓
    • Waiting for datastore to be ready ✓
Enter a new password for the admin console (6+ characters): ••••••••
  • Waiting for Admin Console to be ready ✓
2025/08/05 01:37:52 [DEBUG] POST https://replicated.app/kots_metrics/finish_install/30qb0gCPO3G48BKqjdAhCCRPumi

  • Press Ctrl+C to exit
  • Go to http://localhost:8800 to access the Admin Console

Which issue(s) this PR fixes:

Does this PR require a test?

Does this PR require a release note?

Fixes an issue that causes debug output to print to the kots cli logs when installing.

Does this PR require documentation?