[2201.9.x] Fix RunBuildToolTaskTest assertions

[gayaldassanayake]

Purpose

$ subject

2201.9.x PR of https://github.com/ballerina-platform/ballerina-lang/pull/42645

Approach

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

Samples

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Remarks

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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