Unistore : Ensure Watch works in HA mode. (#93428)

* Replace Watch with WatchNext

* remove watchset

* fix previous page and closing the channel

* Remove the broadcaster cache to prevent dupplicated events

* add watch bookmark

* add watch bookmark

* cleanup comments

* disable the tests for bookmarks for now

* Ensure we send previosu events

* lint

* re-introduce the cache

* load from cache

* disabling legacy test

* disabling legacy test

* Update pkg/storage/unified/resource/server.go

Co-authored-by: Diego Augusto Molina <diegoaugustomolina@gmail.com>

* Could not read previous events

* add proper migration

* Add previous_resource_version to both history and resource

* First event should have an RV of 2 and not 1

* Test both storage backends

* fix the inital RV for the sql backend

* ensure graceful stop of the stream decoder

* gocyclo

---------

Co-authored-by: Diego Augusto Molina <diegoaugustomolina@gmail.com>

pkg/storage/unified/sql/data/resource_insert.sql

@@ -7,6 +7,7 @@ INSERT INTO {{ .Ident "resource" }}
         {{ .Ident "namespace" }},
         {{ .Ident "name" }},
 
+        {{ .Ident "previous_resource_version" }},
         {{ .Ident "value" }},
         {{ .Ident "action" }}
     )
@@ -17,6 +18,7 @@ INSERT INTO {{ .Ident "resource" }}
         {{ .Arg .WriteEvent.Key.Namespace }},
         {{ .Arg .WriteEvent.Key.Name }},
 
+        {{ .Arg .WriteEvent.PreviousRV }},
         {{ .Arg .WriteEvent.Value }},
         {{ .Arg .WriteEvent.Type }}
     )