feat: add progress indication for refreshing environment managers (microsoft#1194)

closes microsoft#1193

Author: eleanorjboyd

src/extension.ts

@@ -178,7 +178,9 @@ export async function activate(context: ExtensionContext): Promise<PythonEnviron
         }),
         commands.registerCommand('python-envs.viewLogs', () => outputChannel.show()),
         commands.registerCommand('python-envs.refreshAllManagers', async () => {
-            await Promise.all(envManagers.managers.map((m) => m.refresh(undefined)));
+            await window.withProgress({ location: { viewId: 'env-managers' } }, async () => {
+                await Promise.all(envManagers.managers.map((m) => m.refresh(undefined)));
+            });
         }),
         commands.registerCommand('python-envs.refreshPackages', async (item) => {
             await refreshPackagesCommand(item, envManagers);