The Heist Mode is a cut game mode from Counter-Strike: Global Offensive.
Placing bush entity on wall map's allows "plant" the bomb to wall.
On the May 31, 2016 update, was added references Convars to "slow money" it's hints towards to be related with mode:
mp_slowmoney_enabled mp_slowmoney_maxmultiplier mp_slowmoney_minmultiplier mp_slowmoney_multiplierdisplayasbonus mp_slowmoney_rampbias mp_slowmoney_rampend mp_slowmoney_rampstart
In the November 28, 2016 update, Adding to game files new terrorist model named
tm_heavy_riot currently without textures it's possible is related to game mode.
In the May 23, 2017 update, said above model was removed from game files.
- func_bomb_target on Valve developer Wiki