Add CI workflows to enhance the dev experience

[umbynos]

Describe the request

Add some checks workflows to this repo to enhance the developer experience and to catch common problems:

• https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/sync-labels.md
• https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-license.md
• https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-markdown-task.md
• https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-taskfiles.md

Describe the current behavior

the CI status is not on pair with the team tooling standard

'arduino/setup-protoc' version

N/A

Additional context

No response

Issue checklist

• I searched for previous requests in the issue tracker
• I verified the feature was still missing when using the latest version
• My request contains all necessary details

[MatteoPologruto]

Check workflows added here:

• Add CI workflow to synchronize with shared repository labels #37
• Add CI workflow to check Markdown files for problems #39
• Add CI workflow to check the license file #40
• Add CI workflow to validate Taskfiles #42