chore(template): adding regression info in the bug template

[shikha372]

Issue # (if applicable)

Closes .

Reason for this change

Update bug template for users to inform about the code changes that resulted in breaking changes.

Description of changes

• Adding checkbox to indicate whether this bug is a regression
• Add option of an input for adding last known CDK version
• Add GH workflow to run when an issue is opened or edit, workflow will add label potential-regression on the basis whether checkbox is selected in issue template or not.

Description of how you validated changes

Validated template here

Label : potential-regression (will be created after approval)
Label will removed if this option is unchecked and added if this option is checked.

Verified with sample issue in personal repo here, can be tested on sample github issue created in personal repo.
Result will be seen in github actions.

Sample issue: shikha372#2
Sample run: https://github.com/shikha372/aws-cdk/actions/runs/10326894628/job/28591182838

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

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✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: cbb6605
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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