chore: [BACKPORT] Remove the feature request issue template

[EmandM]

Purpose of this PR

Removing the Feature Request issue template from this repository as feature requests should probably go through the discussions board.

Jira ticket

n/a

Changelog

Simply an infra PR, doesn't include any package changes.

Documentation

• No documentation changes or additions were necessary.

Testing & QA

No testing required

Functional Testing

Manual testing :

• Manual testing done

Automated tests:

• Covered by existing automated tests
• Covered by new automated tests

Does the change require QA team to:

• Review automated tests?
• Execute manual tests?

If any boxes above are checked, please add QA as a PR reviewer.

Backport

This is a backport of #3622

[cla-assistant-unity]

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