improve error message in SendTransaction json-rpc api (backport #786)

[mergify]

This is an automatic backport of pull request #786 done by Mergify.
Cherry-pick of c8d4d3f has failed:

On branch mergify/bp/release/v0.8.x/pr-786
Your branch is up to date with 'origin/release/v0.8.x'.

You are currently cherry-picking commit c8d4d3f.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   app/ante/ante.go
	modified:   app/ante/eth.go
	modified:   go.mod
	modified:   go.sum
	modified:   rpc/ethereum/backend/backend.go
	modified:   rpc/ethereum/namespaces/eth/api.go
	modified:   rpc/ethereum/namespaces/miner/api.go
	modified:   x/evm/keeper/grpc_query.go
	modified:   x/evm/keeper/keeper.go
	modified:   x/evm/keeper/msg_server.go
	modified:   x/evm/keeper/state_transition.go
	modified:   x/evm/keeper/utils.go
	modified:   x/evm/types/chain_config.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

---

Mergify commands and options

More conditions and actions can be found in the documentation.

You can also trigger Mergify actions by commenting on this pull request:

• @Mergifyio refresh will re-evaluate the rules
• @Mergifyio rebase will rebase this PR on its base branch
• @Mergifyio update will merge the base branch into this PR
• @Mergifyio backport <destination> will backport this PR on <destination> branch

Additionally, on Mergify dashboard you can:

• look at your merge queues
• generate the Mergify configuration with the config editor.

Finally, you can contact us on https://mergify.com

[codecov]

Codecov Report

Merging #788 (0842eb9) into release/v0.8.x (70480d2) will decrease coverage by 0.11%.
The diff coverage is 56.38%.

@@                Coverage Diff                 @@
##           release/v0.8.x     #788      +/-   ##
==================================================
- Coverage           57.45%   57.34%   -0.12%     
==================================================
  Files                  71       71              
  Lines                6107     6037      -70     
==================================================
- Hits                 3509     3462      -47     
+ Misses               2396     2373      -23     
  Partials              202      202              

Impacted Files	Coverage Δ
app/ante/ante.go	49.38% <0.00%> (+1.18%)	⬆️
x/evm/keeper/grpc_query.go	66.09% <0.00%> (ø)
x/evm/keeper/keeper.go	75.86% <0.00%> (ø)
x/evm/keeper/msg_server.go	73.58% <0.00%> (ø)
x/evm/keeper/state_transition.go	76.97% <23.52%> (+0.07%)	⬆️
app/ante/eth.go	85.10% <72.72%> (+2.81%)	⬆️
x/evm/keeper/utils.go	72.85% <72.72%> (-2.15%)	⬇️
x/evm/types/chain_config.go	100.00% <100.00%> (ø)