fix: switch operator micro ubi variant to minimal variant for missing certs

[TomerFi]

The micro variant of UBI is missing the certs existing in the minimal variant, these certs are required for the telemetry service and produce the following error when missing:

{"level":"error","ts":1761771396.9468894,"caller":"telemetry/telemetry.go:231","msg":"Failed initial telemetry check","error":"failed to check for updates: failed to send request to update API: Get \"https://updates.stacklok.com/api/v1/version\": tls: failed to verify certificate: x509: certificate signed by unknown authority","stacktrace":"github.com/stacklok/toolhive/pkg/operator/telemetry.(*Service).StartTelemetryWorker\n\t/workspace/pkg/operator/telemetry/telemetry.go:231\ngithub.com/stacklok/toolhive/pkg/operator/telemetry.(*LeaderTelemetryRunnable).Start.func1\n\t/workspace/pkg/operator/telemetry/telemetry.go:58"}

I've confirmed the error is not logged when using the minimal variant of UBI.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.57%. Comparing base (b6a5e46) to head (eca3999).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2424      +/-   ##
==========================================
- Coverage   54.58%   54.57%   -0.02%     
==========================================
  Files         265      265              
  Lines       25599    25599              
==========================================
- Hits        13974    13970       -4     
- Misses      10297    10307      +10     
+ Partials     1328     1322       -6     

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