Add needs-triage label and Tasks checklist as a reference

[vincent6767]

Updated the roadmap item template

1. Add a needs-triage label if the roadmap item needs to be triaged. If it's already triaged, then you can remove it.
2. Add a checklist as a reference so the maintainer what use the suggested format to link respective tasks.

RFC reference: https://github.com/o3de/sig-release/issues/79

Action Needed

Since the RFC leverage three labels, kind/roadmap, needs-triage, and triage/accepted, please create this label in your SIG repo if it does not exist already once you merge the PR.

needs-triage

Taken from O3DE label label name: needs-triage description: Indicates an issue or PR lacks a triage/foo label and requires one

triage/accepted

Taken from O3DE Label

• label name: triage/accepted
• description: Indicates an issue or PR is ready to be actively worked on.

Signed-off-by: Vincent vincentbiasa6767@gmail.com

[vincent6767]

Hi @chanmosq @aFinchy , a friendly reminder to help review by next week as we want every SIG to have a roadmap according to the RFC attached above by February 6th, 2023.

[vincent6767]

Thanks @chanmosq I'll merge the PR.