Fix "install" phase for Ignition 8.3

### Issue
The install phase on Ignition 8.3 does not seem to work as intended. The console output shows:
`[INFO] Deploying to http://localhost:8088/main/system/DeveloperModuleLoadingServlet`
But then it fails silently to deploy the module, leaving no feedback in the console or in the Ignition gateway logs. The lack of an automated way to deploy modules during development leads to poor developer experience.

On the ignition-module-tools repository, I saw an [issue](https://github.com/inductiveautomation/ignition-module-tools/issues/69) that says that the developer module loading servlet was removed. If that is true, I'm not sure what the solution to this issue is or if there is different intended workflow now.

Start by inspecting the plugin's install phase and the deployment request shown in the issue, then read the linked ignition-module-tools issue 69 about removal of the developer module loading servlet. Determine the supported Ignition 8.3 development workflow and whether the plugin should adapt or report a failure. Done means module deployment works on Ignition 8.3 or the unsupported workflow is surfaced clearly.

Written by the indexing model from the issue text.