Move cooldown time to Tendermint

[yzang2019]

Describe your changes and provide context

Auto remediation is controlled at the Tendermint level, we should apply cooldown time in the upper layer, otherwise, tendermint doesn't really know if we have successfully restarted or not.

Testing performed to validate your change

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (daecc34) 55.38% compared to head (86214a2) 55.37%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #384      +/-   ##
==========================================
- Coverage   55.38%   55.37%   -0.02%     
==========================================
  Files         620      620              
  Lines       51605    51583      -22     
==========================================
- Hits        28582    28563      -19     
+ Misses      20940    20937       -3     
  Partials     2083     2083              

Files	Coverage Δ
server/util.go	42.05% <100.00%> (-0.57%)	⬇️
x/accesscontrol/keeper/msg_server.go	50.00% <ø> (-50.00%)	⬇️
server/start.go	21.91% <0.00%> (+0.36%)	⬆️

... and 1 file with indirect coverage changes