[Debugger] Disable stepping into external sources in low-code mode

[NipunaRanasinghe]

Purpose

This PR disables stepping into external sources in low-code mode while debugging.
This is because the external resources renderings is not yet supported in low-code mode.

Samples

Provide high-level details about the samples related to this feature.

Remarks

List any other known issues, related PRs, TODO items, or any other notes related to the PR.

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

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 28 lines in your changes missing coverage. Please review.

Project coverage is 77.41%. Comparing base (f0008ac) to head (100723a).
Report is 22 commits behind head on master.

Files with missing lines	Patch %	Lines
.../ballerinalang/debugadapter/JDIEventProcessor.java	8.00%	22 Missing and 1 partial ⚠️
...nalang/debugadapter/config/ClientConfigHolder.java	50.00%	2 Missing and 2 partials ⚠️
...lerinalang/debugadapter/JBallerinaDebugServer.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #43732      +/-   ##
============================================
+ Coverage     77.39%   77.41%   +0.01%     
- Complexity    58622    58623       +1     
============================================
  Files          3447     3445       -2     
  Lines        219242   219204      -38     
  Branches      28971    28973       +2     
============================================
  Hits         169693   169693              
+ Misses        40118    40078      -40     
- Partials       9431     9433       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.