test(ci): add service-specific tests to PR workflow and update test data

[ishandhanani]

Overview

This PR enhances our CI pipeline by adding service-specific tests to the PR workflow and updates test data for the AgentService. These changes improve our testing coverage and ensure more robust service validation during the PR process.

Changes Made

• Added service-specific tests for AgentService, PDFService, and TTSService to the PR workflow
• Updated TranscriptionRequest test data in AgentService to include more comprehensive and realistic sample data
• Modified PDFService test to use hardcoded sample files and include additional request parameters
• Updated TTSService test to use a relative path for the sample JSON file
• Refactored test scripts to improve readability and maintainability

[ishandhanani]

Some work needs to be done making sure these all run in parallel properly. However - e2e CI still works on main so will keep it at that