Notify first time contributor / community contributors to fulfill PR checklists

[HuangJunye]

• ask to add release notes if needed
• ask to add test if needed
• qiskit-bot to tag Documentation and Changelog: None if the PR is only contain documentation changes

[jakelishman]

Contributors aren't empowered to tag - only people with the "triage" permission on the relevant repo can do that.

[HuangJunye]

@jakelishman Sorry the description was not very clear. I wrote down this as note while meeting with Luciano. The idea is to use the bot to tag not asking the contributors to tag.

[jakelishman]

Ah yeah, that makes sense thanks!