[Debugger] Update debugger project loader to support bal persist sources

[NipunaRanasinghe]

Purpose

$subject to fix intermittent debugger failures on Ballerina projects with Bal persist sources.

Temporarily fixes #43538
Related to https://github.com/wso2-enterprise/internal-support-ballerina/issues/803

Remarks

As per #43538 (comment), a generic approach to address these kind of tooling file specific issues should be addressed from the Ballerina platform side. This is done as a temporary workaround until we get there.

Related issues: #43537

Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[ayeshLK]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 56.00000% with 11 lines in your changes missing coverage. Please review.

Project coverage is 77.56%. Comparing base (66f7b52) to head (574e734).
Report is 36 commits behind head on master.

Files with missing lines	Patch %	Lines
...ballerinalang/debugadapter/utils/PackageUtils.java	56.00%	4 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #43578   +/-   ##
=========================================
  Coverage     77.55%   77.56%           
- Complexity    58722    58753   +31     
=========================================
  Files          3447     3448    +1     
  Lines        219658   219732   +74     
  Branches      28915    28923    +8     
=========================================
+ Hits         170365   170425   +60     
- Misses        39892    39909   +17     
+ Partials       9401     9398    -3     

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