improve 'mage checkNoChanges' error message

[AndersonQ]

What does this PR do?

Improves the 'mage checkNoChanges' error message making it better explain what might be causing the error and the possible solitions.

Why is it important?

The current error message states running mage update will fix the problems, however it isn't always true.

Checklist

• My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added an entry in CHANGELOG.md

Related issues

• N/A

[elasticmachine]

💚 Build Succeeded

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• Commit: 827e2b0

cc @AndersonQ

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-08-21T09:10:13.170+0000

• Duration: 11 min 48 sec

Test stats 🧪

Test	Results
Failed	0
Passed	791
Skipped	25
Total	816

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