Replaced individual plugin upload steps with a single reusable `plugin-update` action to streamline the GitHub Actions workflow. This change improves maintainability by reducing redundant code and centralizing the upload logic.

Renamed and split the plugin upload steps in the workflow for better clarity and organization. Added specific names for each upload action, differentiating between HI2UC and HIColorer uploads.

This action uploads a specified plugin file as an artifact. It has a required input for the file name and uses the `upload-artifact` action to perform the upload. Former individual upload steps are replaced by a single step that takes the file name as an input.

Corrected the indentation under the 'Upload HI2UC' and 'Upload HIColorer' steps to ensure the workflow executes correctly. Indentation consistency is crucial for proper parsing of the YAML file in GitHub Actions.

Changed the path used to upload the HIColorer plugin in the GitHub Actions workflow. It now correctly points to the plugin-upload directory instead of the plugin-update directory.

Simplify the workflow by switching to a matrix strategy for uploading plugins. This change consolidates individual upload steps into a single matrix job, making the code cleaner and easier to maintain. Added a comment link to the GitHub actions documentation for clarity.

The checkout step is now included in the workflow to ensure the repository is available for subsequent steps. This change is crucial for successful artifact uploads and overall workflow execution.

Previously commented out upload steps for HI2UC and HIColorer have been re-enabled. Additionally, the non-functional `upload-job` configuration has been commented out for clarity.

The workflow file has been modified to use `microsoft/setup-msbuild@v2` instead of `v1`. This ensures compatibility with the latest features and improvements offered in the updated action.