This pull request includes significant enhancements to the DotnetTool class and its testing suite. The changes include the addition of a new method to find the tool executable, improvements to the executeTool method, and the creation of comprehensive unit tests.

Enhancements to DotnetTool class:

• Added findToolExecutable method to locate the tool executable by checking the base path, architecture-specific paths, and subdirectories. This method handles different platforms and architectures.
• Updated executeTool method to utilize the new findToolExecutable method, improving the robustness of locating the tool executable.

Unit tests for DotnetTool:

• Created a new test suite in dotnet-tool.spec.ts to test the functionality of the DotnetTool class, including the findToolExecutable and disableTelemetry methods. This includes mocking dependencies and simulating different environments.

Closes #1515