Fix v4 TODOs

[dzmitryhil]

Description

• Remove legacy TestWASMBankSendContractWithMultipleFundsAttached test.
• Move some TODOs to v5
• Add comments for the block legacy RPC results

Reviewers checklist:

• Try to write more meaningful comments with clear actions to be taken.
• Nit-picking should be unblocking. Focus on core issues.

Authors checklist

• Provide a concise and meaningful description
• Review the code yourself first, before making the PR.
• Annotate your PR in places that require explanation.
• Think and try to split the PR to smaller PR if it is big.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7a7e569) 33.12% compared to head (295215f) 33.12%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #771   +/-   ##
=======================================
  Coverage   33.12%   33.12%           
=======================================
  Files         169      169           
  Lines       48141    48141           
=======================================
  Hits        15948    15948           
  Misses      29164    29164           
  Partials     3029     3029           

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[wojtek-coreum]

Reviewed 1 of 1 files at r1, 4 of 4 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @miladz68 and @ysv)

[miladz68]

Reviewed 1 of 1 files at r1, 4 of 4 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ysv)