feat:Refactor CI/CD workflows and enhance testing coverage

[aunchagaonkar]

Key changes:

• Added testing dependencies: MockK for mocking, Hilt for test dependency injection, and kotlinx-coroutines-test for coroutine testing.
• Implemented unit tests for the data, domain, and presentation layers, covering ViewModels, UseCases, Repositories, and DataSources.
• Added a lightweight unit test for the utility functions.
• Updated the README.md with detailed instructions on how to run the unit tests.
• Configured the build to support the new tests.
• Updated build.yml to include pull request triggers for feature branches and added unit test execution step.
• Removed build_pull_request.yml file.

[Copilot]

Pull Request Overview

This PR refactors the CI/CD workflows and significantly enhances testing coverage by implementing comprehensive unit tests across all application layers. The changes modernize the build process and provide extensive test coverage for ViewModels, UseCases, Repositories, and DataSources.

• Consolidated CI/CD workflows by removing the separate PR build workflow and extending the main build workflow to handle pull requests
• Implemented comprehensive unit testing infrastructure with MockK, Hilt testing support, and coroutine testing utilities
• Added unit tests covering data layer (repositories and data sources), domain layer (use cases), and presentation layer (view models)

Reviewed Changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/build.yml	Extended to support PR triggers and added unit test execution with artifact uploads
.github/workflows/build_pull_request.yml	Removed redundant PR-specific workflow
.github/workflows/release.yml	Cleaned up by removing Gradle cache configuration
gradle/libs.versions.toml	Added testing dependencies (MockK, coroutines-test, Hilt testing)
app/build.gradle.kts	Configured test options and added testing dependencies
hiddenapi/build.gradle.kts	Removed targetSdk configuration
README.md	Updated with testing instructions and corrected repository references
app/src/test/java/...	Added comprehensive unit tests for all application layers

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