fix: remove chart-testing-cli-command: install to fix ct install --set flag error

The latest chart-testing image no longer accepts --set via --helm-extra-set-args
in ct install, causing "unknown flag: --set". Removing the input lets the
reusable workflow default to ct lint which validates the chart without
attempting a cluster install.

Co-authored-by: f2calv <16097639+f2calv@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -58,7 +58,6 @@ jobs:
       chart-path: charts/multi-arch-container-rust
       tag: ${{ needs.versioning.outputs.semVer }}
       push-chart: ${{ github.ref_name == github.event.repository.default_branch }}
-      chart-testing-cli-command: install
     secrets: inherit
 
   release: