[DISCO-3826] Remove Polygon from default provider list (#1182)

Author: Herraj

merino/configs/default.toml

@@ -726,7 +726,7 @@ cache_db = 0
 
 # MERINO_PROVIDERS__POLYGON__ENABLED_BY_DEFAULT
 # Whether this provider is enabled by default.
-enabled_by_default = true
+enabled_by_default = false
 
 # MERINO_PROVIDERS__POLYGON__SCORE
 # The ranking score for this provider as a floating point number.