fix(rpc): handle case when node is not persisting abci responses (backport #1863)

[mergify]

This is an automatic backport of pull request #1863 done by Mergify.
Cherry-pick of d06c4c8 has failed:

On branch mergify/bp/release/v15.0.x/pr-1863
Your branch is up to date with 'origin/release/v15.0.x'.

You are currently cherry-picking commit d06c4c87.
  (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:   rpc/backend/backend.go
	modified:   rpc/backend/blocks.go
	modified:   rpc/backend/call_tx.go
	modified:   rpc/backend/chain_info.go
	modified:   rpc/backend/utils.go
	modified:   rpc/namespaces/ethereum/eth/api.go
	new file:   tests/nix_tests/configs/discard-abci-resp.jsonnet
	new file:   tests/nix_tests/test_no_abci_resp.py

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

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[codecov]

Codecov Report

Merging #1868 (c2c3e28) into release/v15.0.x (848d850) will decrease coverage by 0.02%.
Report is 4 commits behind head on release/v15.0.x.
The diff coverage is 60.00%.

❗ Current head c2c3e28 differs from pull request most recent head ed4a447. Consider uploading reports for the commit ed4a447 to get more accurate results

@@                 Coverage Diff                 @@
##           release/v15.0.x    #1868      +/-   ##
===================================================
- Coverage            70.45%   70.43%   -0.02%     
===================================================
  Files                  314      314              
  Lines                23347    23355       +8     
===================================================
+ Hits                 16449    16451       +2     
- Misses                6073     6078       +5     
- Partials               825      826       +1     

Files	Coverage Δ
rpc/backend/backend.go	76.47% <ø> (ø)
rpc/backend/blocks.go	84.92% <100.00%> (ø)
rpc/backend/chain_info.go	81.28% <100.00%> (-0.11%)	⬇️
rpc/backend/call_tx.go	59.41% <57.14%> (-0.33%)	⬇️
rpc/backend/utils.go	43.09% <40.00%> (-0.41%)	⬇️