Fix inconsistencies in response binding

[TharmiganK]

Purpose

$Subject

Fixes: ballerina-platform/ballerina-library#6414
Fixes: ballerina-platform/ballerina-library#6416

Examples

public function main() returns error? {
    http:Client albumHttpClient = check new ("http://localhost:9090/api");
    
    // All of the following are supported
    http:Response|anydata targetType = check albumHttpClient->/albums/[2];
    http:Response|anydata|http:ClientError unionResult = albumHttpClient->/albums/[2];
    http:Response response = check albumHttpClient->/albums/[2];
    anydata data = check albumHttpClient->/albums/[2];
}

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility
• Checked the impact on OpenAPI generation

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 83.67347% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 80.89%. Comparing base (8da69b6) to head (cc680b7).

Files	Patch %	Lines
...vice/signature/builder/AbstractPayloadBuilder.java	75.75%	2 Missing and 6 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1968      +/-   ##
============================================
+ Coverage     80.55%   80.89%   +0.33%     
- Complexity        0      562     +562     
============================================
  Files           353      389      +36     
  Lines         19840    21614    +1774     
  Branches       4623     4978     +355     
============================================
+ Hits          15982    17484    +1502     
- Misses         2990     3116     +126     
- Partials        868     1014     +146     

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