Add test helper functions and update test files

[jameslong]

This pull request refactors request-building functions in the Vancouver codebase to improve naming consistency and clarity. The changes include renaming methods and updating their references across the codebase.

Refactoring of request-building functions:

• Renamed build_request/2 to build_get_request/2 in lib/vancouver/test/prompt_test.ex and updated its references in test/vancouver/test/prompt_test.exs to reflect the new name. [1] [2]
• Renamed call_request/2 to build_call_request/2 in lib/vancouver/test/tool_test.ex and updated its references in test/vancouver/test/tool_test.exs, test/vancouver/tools/calculate_sum_test.exs, and test/vancouver/tools/test_response_test.exs. [1] [2] [3] [4] [5]

[Copilot]

Pull Request Overview

This PR refactors request-building functions in the Vancouver codebase for improved naming consistency and clarity.

• Renamed build_request/2 to build_get_request/2 and updated relevant tests.
• Renamed call_request/2 to build_call_request/2 with corresponding changes in both tests and library code.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/vancouver/tools/test_response_test.exs	Updated function call from call_request to build_call_request.
test/vancouver/tools/calculate_sum_test.exs	Corrected function call reference from call_request to build_call_request.
test/vancouver/test/tool_test.exs	Updated describe block and assertions to refer to build_call_request.
test/vancouver/test/prompt_test.exs	Updated describe block and assertions to refer to build_get_request.
lib/vancouver/test/tool_test.ex	Replaced call_request with build_call_request along with updated docs.
lib/vancouver/test/prompt_test.ex	Renamed build_request to build_get_request with updated spec and docs.