runtime-sdk/modules/evm: Drop signed queries in new contracts

[kostko]

TODO

• More tests.

[codecov]

Codecov Report

Merging #1481 (75870b3) into main (b178b66) will increase coverage by 0.72%.
The diff coverage is 74.02%.

@@            Coverage Diff             @@
##             main    #1481      +/-   ##
==========================================
+ Coverage   59.51%   60.24%   +0.72%     
==========================================
  Files         138      138              
  Lines        9631     9707      +76     
==========================================
+ Hits         5732     5848     +116     
+ Misses       3857     3817      -40     
  Partials       42       42              

Files Changed	Coverage Δ
runtime-sdk/modules/evm/src/backend.rs	69.95% <66.66%> (-0.05%)	⬇️
runtime-sdk/modules/evm/src/lib.rs	64.20% <66.66%> (+20.59%)	⬆️
runtime-sdk/modules/evm/src/types.rs	66.66% <66.66%> (ø)
runtime-sdk/modules/evm/src/mock.rs	80.24% <70.21%> (-10.93%)	⬇️
runtime-sdk/src/testing/mock.rs	87.30% <80.00%> (-0.63%)	⬇️
runtime-sdk/modules/evm/src/state.rs	93.10% <100.00%> (+1.43%)	⬆️

... and 1 file with indirect coverage changes