fix: race with udevd and mountUserDisks

Fixes #7246

The problem was that `udevd` watches via `inotify` any attempts to open
blockdevices with 'write' access.

Talos was opening with write access, but actually accessing as
read-only, so the fix is to open as read-only.

Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>

internal/app/machined/pkg/runtime/v1alpha1/v1alpha1_sequencer_tasks.go

@@ -1037,7 +1037,7 @@ func partitionAndFormatDisks(logger *log.Logger, r runtime.Runtime) error {
 		disk := disk
 
 		if err := func() error {
-			bd, err := blockdevice.Open(disk.Device())
+			bd, err := blockdevice.Open(disk.Device(), blockdevice.WithMode(blockdevice.ReadonlyMode))
 			if err != nil {
 				return err
 			}