fix(ci): install yq for Helm ownership test

The split-chart ownership regression uses yq to inspect rendered YAML,
but the Helm CI container installs only tools declared in mise.
Declare and lock yq so mise install --locked provides the test dependency.

Signed-off-by: Dhiraj Bokde <dbokde@nvidia.com>

Author: dhirajsb

mise.lock

@@ -33,6 +33,7 @@ go = "1.26"
 buf = "1.72.0"
 helm = { version = "4.2.0", version_prefix = "v" }
 helm-docs = "1.14.2"
+yq = "4.53.6"
 skaffold = { version = "2.20.0", os = ["linux", "macos"], version_prefix = "v" }
 # Keep k3d out of Linux CI images until upstream ships a release rebuilt with
 # patched Go/container dependencies. Linux Kubernetes E2E uses kind or an