Make test functions isolated

[TharmiganK]

Purpose

$Subject

Part of: ballerina-platform/ballerina-library#6120

This is to run the tests in parallel with the new parallel test feature

Examples

N/A

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.92%. Comparing base (887171a) to head (175d48f).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #105      +/-   ##
============================================
+ Coverage     86.20%   87.92%   +1.71%     
- Complexity      226      315      +89     
============================================
  Files            22       38      +16     
  Lines           522      712     +190     
  Branches        104      136      +32     
============================================
+ Hits            450      626     +176     
- Misses           51       56       +5     
- Partials         21       30       +9     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud