[Improvement] Fix a potential problem when editing an existing mysql data source

[echohlne]

Purpose of the pull request

Fix a potential problem that editing an existing mysql data source may cause the backend to return null data.
reproduce step:

1. Create a normal MySQL data source
2. Modify the IP of the data source created in the step 1, by modify ip to a non-existent IP, and then directly click the edit button (skip the test connection), then we'll seen an error message tip with no content

Request URL: http://localhost:8888/dolphinscheduler/datasources/update
response {"code":null,"msg":null,"data":null}

Brief change log

fix a special case in edit an existing datasource.

Result<Object> isConnection = checkConnection(dataSource.getType(), connectionParam);
        if (Status.SUCCESS.getCode() != isConnection.getCode()) {
            return result;
        }

The result instance does not have a certain code and msg value, which results in the content returned to the front end shows as null. In this case, just return isConnection directly.

Verify this pull request

Using Existed UTs.
Alse munutal test works well

[CalvinKirs]

LGTM

[codecov-commenter]

Codecov Report

Merging #5670 (66b8cfa) into dev (a768214) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##                dev    #5670   +/-   ##
=========================================
  Coverage     45.31%   45.32%           
+ Complexity     3673     3672    -1     
=========================================
  Files           607      607           
  Lines         24794    24794           
  Branches       2803     2803           
=========================================
+ Hits          11235    11237    +2     
+ Misses        12489    12486    -3     
- Partials       1070     1071    +1     

Impacted Files	Coverage Δ
...eduler/api/service/impl/DataSourceServiceImpl.java	44.76% <0.00%> (ø)
...dolphinscheduler/remote/future/ResponseFuture.java	81.35% <0.00%> (-1.70%)	⬇️
...er/master/processor/queue/TaskResponseService.java	68.49% <0.00%> (+4.10%)	⬆️

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication