Added label to py_wheel progress message.

[UebelAndre]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature (please, look at the "Scope of the project" section in the README.md file)
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

The progress message for py_wheel is pretty generic and it makes logs less useful.

What is the new behavior?

This change adds the label to the progress message so developers can quickly identify what's being built.

Does this PR introduce a breaking change?

• Yes
• No

Other information