RSDK-12450: Fix --cloud-config arg in reload command

[michaellee1019]

The reload commands had a bug where it directly references arg.PartID instead of partId variable. Earlier in the code path the partId variable is resolved from either --part-id or --cloud-config. Also added unit tests to ensure we don't break in the future.

Found a similar issue with restart. Its a bit more of a edge case because I doubt anyone will restart with --cloud-config (in this case you would just kill the viam-server you have running locally), but felt like the consistency is nice.

Testing

michaellee@ROBOT-MYHLX2FTJN control-groups % viam module reload --cloud-config ~/Downloads/viam-animatedartvs-main.json 
 …  Preparing for build...
 ✓     → Module is registered (0s)                                                                                                                                                                                          
 ✓     → Source code archive created (0s)                                                                                                                                                                                   
 ✓     → Source code uploaded (1s)                                                                                                                                                                                          
 ✓  Prepared for build (2s)
 …  Building...
 ✓     → Build started (ID: a6fea04d-69e2-445c-9612-6b1613a7d66d) (5s)                                                                                                                                                      
 ✓     → Spin up environment (30s)                                                                                                                                                                                          
 ✓     → Install dependencies (2s)                                                                                                                                                                                          
 ✓     → Build module (44s)                                                                                                                                                                                                 
 ✓     → Uploading artifacts (8s)                                                                                                                                                                                           
 ✓  Built (1m29s)
 …  Reloading to part...
 ✓     → Build artifact downloaded (3s)                                                                                                                                                                                     
 ✓     → Shell service already exists (0s)                                                                                                                                                                                  
 ✓     → Package uploaded (6s)                                                                                                                                                                                              
 ✓     → Module added to part (0s)                                                                                                                                                                                          
 ✓  Reloaded to part (9s)

michaellee@ROBOT-MYHLX2FTJN control-groups % viam module restart --cloud-config ~/Downloads/viam-animatedartvs-main.json 

[stuqdog]

lgtm, thanks for catching/fixing!