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/testdata/sqlite--resource_insert-simple.sql

@@ -5,6 +5,7 @@ INSERT INTO "resource"
         "resource",
         "namespace",
         "name",
+        "previous_resource_version",
         "value",
         "action"
     )
@@ -14,6 +15,7 @@ INSERT INTO "resource"
         'rr',
         'nn',
         'name',
+        123,
         '[]',
         'ADDED'
     )