[1952] feat(controller): inject OS_*_API_VERSION env vars from clouds.yaml

Completes the microversion floor wiring end-to-end. T020 (PR #1) made
v2v-helper read OS_COMPUTE_API_VERSION / OS_VOLUME_API_VERSION /
OS_IMAGE_API_VERSION / OS_NETWORK_API_VERSION / OS_IDENTITY_API_VERSION
and feed them through pkg/common/microversion.Floor. This commit
fills the producer side: when the credential Secret is clouds.yaml-keyed,
the controller parses the per-service api_version fields out of the
selected cloud entry and injects them as explicit Env vars on the
v2v-helper Job spec. Legacy OS_*-keyed Secrets are unchanged — the
EnvFrom block auto-loads any OS_*_API_VERSION keys that happen to be
present.

Changes:
- pkg/utils/clouds_yaml.go: MicroversionsToEnvVars(map) returns
  []EnvVarPair with deterministic ordering (compute, volume, image,
  network, identity). Empty values and unknown service names are
  silently skipped.
- pkg/utils/clouds_yaml_test.go: 5 table-driven cases covering nil,
  empty, two services, all five services, empty-value skip, and
  unknown-service skip.
- internal/controller/migrationplan_controller.go: CreateJob takes a
  new openstackCloudName parameter. After the existing envVars init,
  buildMicroversionEnvVars (new) reads the Secret, dispatches via
  SecretContainsCloudsYAML, runs ParseCloudsYAML against the
  cloudName, and appends the env vars to the Job spec. Errors at
  this step are logged but non-fatal — the legacy EnvFrom path
  remains in play.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: gtherond

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