Update UI to indicate when a plugin attached to an entrypoint is out-of-date

[keithmanville]

We want the UI to indicate when a plugin attached to an entrypoint is out-of-date and provide a mechanism to sync to the latest version of plugins.

To do this, we need to update relationships between Entrypoints, Plugins, and Plugin files enable Entrypoint to Plugin syncing behavior.

Tasks

• [x] Split the EntryPointPluginFiles table into two many-to-many linking tables: EntrypointPlugins and PluginPluginFiles
• [x] Create new database migration scripts
• [ ] Update EntrypointService.create, EntrypointIdService.modify, EntrypointIdPluginsService.append, and EntrypointIdPluginFilesId.delete services to use the new EntryPointPlugin linking table
• [ ] Update build_entrypoint to use the new EntrypointPlugin linking table to retrieve plugin information
• [ ] Update the PluginIdService.modify service to create PluginPluginFiles entries for the new snapshot
• [ ] Add a mapped_column to Plugin that retrieves linked PluginFile snapshots
• [ ] Update the PluginIdService.get and all other get services in plugins.py to retrieve latest PluginFile snapshots from the PluginPluginFile linking table instead of via separate query
• [ ] Update any services that create, modify, or delete a PluginFile to create a new Plugin Snapshot that is properly linked to PluginFiles via the new PluginPluginFiles table
• [ ] Remove the plugin_files key from PluginWithPluginFIlesDict and rename it PluginDict
• [ ] Update build_entrypoint_plugin and build_plugin to use new PluginDict class
• [ ] Update all service layer use of PluginWithFilesDict to use PluginDict (primarily as return types of functions)
• [ ] Update the UI to indicate when a plugin is out of date (this should check Plugin.latestSnapshot)
• [ ] Update the UI to provide a button to sync plugins to the latest version (this should use POST to /entrypoints/{id}/plugins)

Definition of done

• [ ] All tasks are implemented
• [ ] All tests pass
• [ ] Feature is merged to dev