Use gas overflow error for ToWasmVMGas (backport #2195)

[mergify]

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This is an automatic backport of pull request #2195 done by [Mergify](https://mergify.com).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.96%. Comparing base (6655b4a) to head (fe1ec52).
Report is 12 commits behind head on releases/v0.6x.

Additional details and impacted files

@@                Coverage Diff                 @@
##           releases/v0.6x    #2248      +/-   ##
==================================================
- Coverage           45.98%   45.96%   -0.02%     
==================================================
  Files                  78       78              
  Lines               10684    10684              
==================================================
- Hits                 4913     4911       -2     
- Misses               5334     5335       +1     
- Partials              437      438       +1     

Files with missing lines	Coverage Δ
x/wasm/types/gas_register.go	97.40% <100.00%> (ø)

... and 1 file with indirect coverage changes

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