Refactor GitHub Actions workflows to streamline build and release processes

[marko-stanojevic]

This pull request refactors and streamlines the CI/CD workflow for building, packaging, and testing PowerShell modules. The main improvements include centralizing build logic into a reusable GitHub Action, enhancing artifact handling, and simplifying the workflow structure. These changes improve maintainability, modularity, and efficiency of the build and test pipeline.

Workflow and Build Process Refactoring:

• Introduced a dedicated build job in .github/workflows/ci.yml that uses a custom composite action (.github/actions/ps-build) to encapsulate the module build, packaging, and artifact upload steps, replacing the previous inline build steps. [1] [2]
• Updated the unit-tests and integration-tests jobs to depend on the new build job and to download all build artifacts using the latest version of actions/download-artifact, ensuring consistency and reducing duplication. [1] [2]

Composite Action Improvements (ps-build):

• Added a .NET 8.0.x setup step and removed the unused module-list input from .github/actions/ps-build/action.yml, streamlining the action's configuration. [1] [2]
• Modified the build step to use the computed build version and configurable release type, and added steps to create and upload NuGet packages and module binaries as artifacts.

Packaging Consistency:

• Updated the release workflow (ps-release) to include a step for creating a NuGet package from build artifacts, aligning it with the new build process.