[main] Updated issues template

[gmalheiro]

Many thanks for submitting your Pull Request :heart:!

Please make sure that your PR meets the following requirements:

• [x] You have read the contributors guide
• [x] Your code is properly formatted according to our code style
• [x] Pull Request title contains the target branch if not targeting main: [0.9.x] Subject
• [x] Pull Request contains link to the issue
• [ ] Pull Request contains link to any dependent or related Pull Request
• [x] Pull Request contains description of the issue
• [x] Pull Request does not include fixes for issues other than the main ticket

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Issue description:

Updated the issue template to improve issue categorization and handling by adding specific fields and clarifications. This update ensures that all necessary information is captured right at the start, aiding in more efficient issue resolution.

Fixes #677

[github-actions[bot]]

🎊 PR Preview e51dc0d65d3d83ba4c9dad740bb8b7a8dfb56263 has been successfully built and deployed. See the documentation preview: https://quarkus-openapi-generator-preview-pr-726.surge.sh

[gmalheiro]

@ricardozanini I've removed the lines you requested. Thanks for the feedback! Could you please confirm if everything is as expected?

[gmalheiro]

@mcruzdev Thanks for the suggestions! I accepted them!

@hbelmiro I removed the assignees section! Thanks for the feedback.

[mcruzdev]

Thank you @gmalheiro, could you squash the commits?

[gmalheiro]

@mcruzdev Done! Thanks for the support! 😁

[gmalheiro]

@ricardozanini Tks for the suggestions! I accepted it!

[hbelmiro]

@all-contributors add @gmalheiro for docs.

[allcontributors[bot]]

@hbelmiro

I've put up a pull request to add @gmalheiro! :tada: