refactor tests for cosmwasm/wasm/v1/tx.proto other than TestClearAdmin

[Kynea0b]

Description

Refactor TestInstantiateContract, TestInstantiateContract2, TestMigrateContract, and TestExecuteContract
Spec: https://github.com/Finschia/wasmd/blob/main/docs/proto/proto-docs.md#cosmwasm/wasm/v1/tx.proto
close #86

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly. (not needed)
• I have updated API documentation client/docs/swagger-ui/swagger.yaml (not needed)

[da1suk8]

The instantiateResponse of TestInstantiateContract2 is also not needed and could be removed.

[codecov]

Codecov Report

Merging #100 (c27e2ec) into main (93fed34) will increase coverage by 0.02%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

❗ Current head c27e2ec differs from pull request most recent head e05535b. Consider uploading reports for the commit e05535b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #100      +/-   ##
==========================================
+ Coverage   63.62%   63.65%   +0.02%     
==========================================
  Files          80       80              
  Lines       10001    10001              
==========================================
+ Hits         6363     6366       +3     
+ Misses       3308     3306       -2     
+ Partials      330      329       -1     

see 1 file with indirect coverage changes

[170210]

LGTM

[Kynea0b]

Thanks for your comment.

The instantiateResponse of TestInstantiateContract2 is also not needed and could be removed.

I unify to test MsgInstantiateContractResponse.