Removing myself from CODEOWNERS since I no longer work on Azure Search (#22033)

Co-authored-by: Bruce Johnston <brjohnst@microsoft.com>

Author: brjohnstmsft

.github/fabricbot.json

@@ -2362,7 +2362,6 @@
               "Search"
             ],
             "mentionees": [
-              "brjohnstmsft",
               "bleroy",
               "tjacobhi",
               "markheff",

CODEOWNERS

@@ -199,7 +199,7 @@
 /specification/scheduler/ @pinwang81
 
 # PRLabel: %Search
-/specification/search/data-plane/ @brjohnstmsft @arv100kri @bleroy @AlexGhiondea @Mohit-Chakraborty @Azure/api-stewardship-board
+/specification/search/data-plane/ @arv100kri @bleroy @AlexGhiondea @Mohit-Chakraborty @Azure/api-stewardship-board
 
 # PRLabel: %Search
 /specification/search/resource-manager/ @abhi1509 @tjacobhi