🚧Improve issue number validation

[CalvinWilkinson]

Complete The Item Below

• I have updated the title without removing the 🚧 emoji.

Description

Improve the issue number validation process when creating pull requests by verifying that the issue has not already been closed. This would indicate that the issue is complete and should not be used.

Also, if the issue exists and is already closed, display a proper error message.

Acceptance Criteria

The items to complete to satisfy the Definition of Done.

Beta Give feedback

1. All unit tests executed and passed locally after PR work is complete. (Why? Refer to 'Additional Information' below.)
2. Issue number validation added
3. Error message displayed if already existing issue is closed

ToDo Items

The items to complete to satisfy the Definition of Done.

Beta Give feedback

1. Change type labels added to this issue. Refer to the Change Type Labels section below.
2. Priority label added to this issue. Refer to the Priority Type Labels section below.
3. Issue linked to the correct milestone (if applicable).

Issue Dependencies

No response

Related Work

No response

Additional Information:

Unit Tests

Reasons for local unit test execution:

• Unit tests might pass locally but not in the CI environment during the status check process or vice-versa.
• Tests might pass on the developer's machine but not necessarily on the code reviewer's machine.
• If you notice that the test status check has passed but the test failed locally, please notify a project maintainer!

💡Warning💡
If the unit tests pass remotely and are not executed locally, this means we could be letting a bug slip into production.
Though bugs will always exist in some capacity, we should all do our part to help prevent them from happening.

Change Type Labels

Change Type	Label
Bug Fixes	🐛bug
Breaking Changes	🧨breaking changes
New Feature	✨new feature
CICD Changes	♻️cicd
Config Changes	⚙️config
Performance Improvements	🏎️performance
Code Doc Changes	🗒️documentation/code
Product Doc Changes	📝documentation/product

Priority Type Labels

Priority Type	Label
Low Priority	low priority
Medium Priority	medium priority
High Priority	high priority

Code of Conduct

• I agree to follow this project's Code of Conduct.