chore: replace shebang with shellcheck 🎨

[robertoschiavone]

Description

This commit replaces every shebang directive with shellcheck.

Motivation and Context

Fixes #2202

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.

[cornfeedhobo]

@robertoschiavone Thanks for your contribution. This effort to uplift shellcheck was decided to be too large, so instead we ask contributors to only uplift sections of the code they are also otherwise improving. To support this on-going effort, we have a clean_files.txt to track which should be linted. You can read more about that here.