[master] Fix bug when return type is byte[] in OpenAPI spec generation

[aneeshafedo]

Purpose

$subject
Resolves ballerina-platform/ballerina-library#5282

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? yes
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Test environment

Java JDK 11

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06% 🎉

Comparison is base (96e88ba) 78.78% compared to head (4817f44) 78.84%.
Report is 41 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    ballerina-platform/openapi-tools#1469      +/-   ##
============================================
+ Coverage     78.78%   78.84%   +0.06%     
- Complexity     1684     1697      +13     
============================================
  Files           124      124              
  Lines          9815     9886      +71     
  Branches       1596     1616      +20     
============================================
+ Hits           7733     7795      +62     
- Misses         1513     1518       +5     
- Partials        569      573       +4     

Files Changed	Coverage Δ
...java/io/ballerina/openapi/converter/Constants.java	73.86% <ø> (ø)
...enapi/converter/service/OpenAPIResponseMapper.java	83.40% <100.00%> (+0.25%)	⬆️
.../openapi/converter/utils/ConverterCommonUtils.java	57.01% <100.00%> (+1.14%)	⬆️

... and 10 files with indirect coverage changes

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[github-actions]

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication