test: add cloud connection test

[huskar-t]

Description

add cloud connection test

Jira: https://jira.taosdata.com:18080/browse/TD-35392

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.11%. Comparing base (da16bf8) to head (b50b637).

Additional details and impacted files

@@            Coverage Diff             @@
##              3.0     #112      +/-   ##
==========================================
+ Coverage   75.08%   75.11%   +0.03%     
==========================================
  Files         106      106              
  Lines        5221     5221              
  Branches      460      460              
==========================================
+ Hits         3920     3922       +2     
+ Misses       1138     1135       -3     
- Partials      163      164       +1     

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