Revert "[#195] object: Add notification well-known attributes"

This reverts commit f67442d.

Notification attributes turned out to be unusable. Nobody uses them, so
they are purged.

Closes #279.

Signed-off-by: Leonard Lyubich <leonard@morphbits.io>

object/types.proto

@@ -135,13 +135,6 @@ message Header {
   //
   // * __NEOFS__EXPIRATION_EPOCH \
   //   Tells GC to delete object after that epoch
-  // * __NEOFS__TICK_EPOCH \
-  //   Decimal number that defines what epoch must produce
-  //   object notification with UTF-8 object address in a
-  //   body (`0` value produces notification right after
-  //   object put)
-  // * __NEOFS__TICK_TOPIC \
-  //   UTF-8 string topic ID that is used for object notification
   //
   // And some well-known attributes used by applications only:
   //

proto-docs/object.md

@@ -903,13 +903,6 @@ that affect system behaviour:
 
 * __NEOFS__EXPIRATION_EPOCH \
   Tells GC to delete object after that epoch
-* __NEOFS__TICK_EPOCH \
-  Decimal number that defines what epoch must produce
-  object notification with UTF-8 object address in a
-  body (`0` value produces notification right after
-  object put)
-* __NEOFS__TICK_TOPIC \
-  UTF-8 string topic ID that is used for object notification
 
 And some well-known attributes used by applications only: