refactor(avoidance): update parameter namespace (autowarefoundation#928)

Signed-off-by: satoshi-ota <satoshi.ota928@gmail.com>

Author: satoshi-ota

autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/avoidance/avoidance.param.yaml

@@ -7,8 +7,6 @@
 
       # avoidance module common setting
       enable_bound_clipping: false
-      enable_yield_maneuver: true
-      enable_yield_maneuver_during_shifting: false
       enable_cancel_maneuver: true
       disable_path_update: false
 
@@ -247,7 +245,8 @@
 
       # For yield maneuver
       yield:
-        yield_velocity: 2.78                            # [m/s]
+        enable: true                                    # [-]
+        enable_during_shifting: false                   # [-]
 
       # For stop maneuver
       stop: