Revert "Emit event for contract registration (#1518)"

[codchen]

This reverts commit e2440de8baf19467f1136c1fda7e60a8a21a3cfb.

Describe your changes and provide context

Testing performed to validate your change

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 60.15%. Comparing base (e2440de) to head (355bd5b).

Additional details and impacted files

@@            Coverage Diff             @@
##            seiv2    #1528      +/-   ##
==========================================
- Coverage   60.21%   60.15%   -0.07%     
==========================================
  Files         363      363              
  Lines       25797    25765      -32     
==========================================
- Hits        15533    15498      -35     
- Misses       9277     9278       +1     
- Partials      987      989       +2     

Files	Coverage Δ
precompiles/pointer/pointer.go	32.62% <ø> (-0.05%)	:arrow_down:
x/evm/gov.go	100.00% <ø> (ø)
x/evm/keeper/msg_server.go	77.27% <ø> (-0.73%)	:arrow_down:

... and 3 files with indirect coverage changes