Add SendGrid API key check task

[rsmoke]

• Introduced a new Rake task to verify the configuration of the SendGrid API key in Rails credentials.
• The task outputs the key's presence, length, and a partial view of the key, or prompts the user to set it if missing.
• This addition enhances the application's email delivery setup by ensuring the necessary API key is configured correctly.

This commit aims to improve the reliability of email functionalities by providing a straightforward way to check SendGrid API key configuration.

Pull Request

Description

Related Issues

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings