Create mr note component

What does this MR do and why?

This MR adds the MR note component only.

Note: the repo that could generate a MR is having some problems, I'm working with the BE to address this. Once it's resolved, I'll add this component to the modal.

Screenshots or screen recordings

MR	MR (with an issue)

How to set up and validate locally

Setup

1. Have the related FF enabled: echo "Feature.enable(:pipeline_security_dashboard_graphql)" | rails c
2. You'll need an EE License
3. You'll need to have runners enabled (See $2408961 for setting up a runner)
4. Import https://gitlab.com/gitlab-examples/security/security-reports
5. Run a pipeline on master

Validation

1. Go to the pipeline's security report tab
2. Click on a finding
3. Apply this patch to see the MR > mr-note-modal.patch

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #387652 (closed)