Refactor environment variable handling

[warunalakshitha]

Purpose

$Subject

Examples

Checklist

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

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +5.03% 🎉

Comparison is base (60e6ef5) 86.30% compared to head (608630b) 91.33%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #505      +/-   ##
============================================
+ Coverage     86.30%   91.33%   +5.03%     
+ Complexity       26       25       -1     
============================================
  Files            16       16              
  Lines           146      127      -19     
  Branches         36       32       -4     
============================================
- Hits            126      116      -10     
+ Misses           18       10       -8     
+ Partials          2        1       -1     

Files Changed	Coverage Δ
...java/io/ballerina/stdlib/os/nativeimpl/GetEnv.java	100.00% <100.00%> (ø)
...ava/io/ballerina/stdlib/os/nativeimpl/ListEnv.java	100.00% <100.00%> (+81.81%)	⬆️
...java/io/ballerina/stdlib/os/nativeimpl/SetEnv.java	100.00% <100.00%> (ø)
...ain/java/io/ballerina/stdlib/os/utils/OSUtils.java	95.23% <100.00%> (+5.23%)	⬆️

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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

[github-actions]

This PR has been open for more than 15 days with no activity. This will be closed in 3 days unless the stale label is removed or commented.