Improved error reporting when decorator manager applies a duplicate decorator

[subhajit20]

Closes #711

• Improved error reporting when the decorator manager applies a duplicate decorator
• Added test for duplicate decorator

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname

[mttrbrts]

Thanks @subhajit20, please also add a unit test for your change.

[mttrbrts]

@subhajit20 There are some linting errors that are causing your build to fail.

/home/runner/work/concerto/concerto/packages/concerto-core/lib/decoratormanager.js
Error:    24:39  error  Strings must use singlequote  quotes
Error:    24:76  error  Missing semicolon             semi
Error:   443:15  error  Missing semicolon             semi

[subhajit20]

@subhajit20 There are some linting errors that are causing your build to fail.

/home/runner/work/concerto/concerto/packages/concerto-core/lib/decoratormanager.js
Error:    24:39  error  Strings must use singlequote  quotes
Error:    24:76  error  Missing semicolon             semi
Error:   443:15  error  Missing semicolon             semi

Hey I have fixed those linting error.

[subhajit20]

I have added the test now.
Could you please review once you have time @mttrbrts

[github-actions]

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