Parallelize provider installation (#2729)

Signed-off-by: Christian Mesh <christianmesh1@gmail.com>

internal/command/init.go

@@ -960,6 +960,8 @@ func (c *InitCommand) getProviders(ctx context.Context, config *configs.Config,
 			}
 		},
 	}
+	// Ensure that events emitted on multiple routines do not trigger race conditions
+	evts = evts.Sync()
 	ctx = evts.OnContext(ctx)
 
 	mode := providercache.InstallNewProvidersOnly