fix: procfile comment parsing

[michaelmalave]

Summary

Updating to ignore Procfile comment lines in local parsing, updating the local fixture to include a top comment, and add unit tests to prevent regressions while preserving existing parse-error behavior for malformed entries.

Type of Change

Breaking Changes (major semver update)

• Add a ! after your change type to denote a change that breaks current behavior

Feature Additions (minor semver update)

• feat: Introduces a new feature to the codebase

Patch Updates (patch semver update)

• fix: Bug fix
• deps: Dependency upgrade
• revert: Revert a previous commit
• chore: Change that does not affect production code
• refactor: Refactoring existing code without changing behavior
• test: Add/update/remove tests

Testing

Notes:

Add comments to a local project with a Procfile

cd /to/local/project
/path/to/cli/bin/run local 

Screenshots (if applicable)

Related Issues

GitHub issue: #3636
GUS work item: [WI number](WI link)

[tlowrimore-heroku]

LGTM!

[stevenharman]

Thanks for the quick turn around. Could we get a new CLI release cut this week? This is tripping our team up - and yes, we could remove the comments. But frankly, they're helpful to both newer teammates, and ourselves down the line when we're wondering "WTF is this doing here, and why like that?" 😆