[master] Allow not having source code for projects with build tools

[gayaldassanayake]

Purpose

$ subject

master PR of #42597
Fixes #42583

Approach

Describe how you are implementing the solutions along with the design details.

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 50.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 77.25%. Comparing base (523fb9c) to head (bdf0210).
Report is 6 commits behind head on master.

Files	Patch %	Lines
...c/main/java/io/ballerina/cli/task/CompileTask.java	25.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #42730      +/-   ##
============================================
+ Coverage     77.18%   77.25%   +0.06%     
- Complexity    51274    51298      +24     
============================================
  Files          2929     2929              
  Lines        204324   204392      +68     
  Branches      26652    26660       +8     
============================================
+ Hits         157698   157893     +195     
+ Misses        38074    37919     -155     
- Partials       8552     8580      +28     

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