ci: remove codeclimate

[sleepdefic1t]

Summary

CodeClimate is no longer used.

• rm ./codeclimate.yml config file.
• rm ./.github/workflows/codeclimate.yml workflow config file.

[codecov[bot]]

Codecov Report

Merging #211 into develop will decrease coverage by 3.06%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #211      +/-   ##
===========================================
- Coverage   100.00%   96.93%   -3.07%     
===========================================
  Files           61       61              
  Lines         1187     1173      -14     
===========================================
- Hits          1187     1137      -50     
- Misses           0       36      +36     

Impacted Files	Coverage Δ
src/transactions/types/ipfs.hpp	0.00% <0.00%> (-100.00%)	:arrow_down:
src/transactions/types/vote.hpp	0.00% <0.00%> (-100.00%)	:arrow_down:
src/transactions/types/assets.hpp	0.00% <0.00%> (-100.00%)	:arrow_down:
src/transactions/types/transfer.hpp	0.00% <0.00%> (-100.00%)	:arrow_down:
src/transactions/types/htlc_lock.hpp	0.00% <0.00%> (-100.00%)	:arrow_down:
src/transactions/types/htlc_claim.hpp	0.00% <0.00%> (-100.00%)	:arrow_down:
src/transactions/types/htlc_refund.hpp	0.00% <0.00%> (-100.00%)	:arrow_down:
src/transactions/types/multi_payment.hpp	0.00% <0.00%> (-100.00%)	:arrow_down:
src/include/cpp-crypto/crypto/message.hpp	0.00% <0.00%> (-100.00%)	:arrow_down:
src/transactions/types/second_signature.hpp	0.00% <0.00%> (-100.00%)	:arrow_down:
... and 5 more

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[sleepdefic1t]

@faustbrian You can retrigger that workflow if you'd like, but that looks like codecov bugging out.

These changes only affect the CodeClimate config and workflow.

This is pretty much identical to C++ Client https://github.com/ArkEcosystem/cpp-client/pull/179; cov isn't impacted there though.