Generate 5x5 grid heat map report on existing open bugs for all group triage packages

We need to start educating teams on how to use different priority and severity levers.

The first iteration is to provide visibility into how the bug distribution looks like for each group.

* Add 5x5 grid heat map. (Mock up below)
* We can reuse @lmcandrew script to generate the table here: https://gitlab.com/lmcandrew/markdown-issue-viewer
* Add a table the top of the triage report, one for all bugs in that group

![Screen_Shot_2019-05-21_at_1.28.31_AM](/uploads/93cb1f7a2c515951831aa8885db271b0/Screen_Shot_2019-05-21_at_1.28.31_AM.png)

## Format
|| ~S1 | ~S2 | ~S3 | ~S4 | `no severity` |
|----|----|----|----|----|----|
~P1 | [2](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=Quality&label_name[]=bug&label_name[]=P1&label_name[]=S1) | [0](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=Quality&label_name[]=bug&label_name[]=P1&label_name[]=S2) | [0](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=Quality&label_name[]=bug&label_name[]=P1&label_name[]=S3) | [0](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=Quality&label_name[]=bug&label_name[]=P1&label_name[]=S3) | 1
~P2 | [0](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=Quality&label_name[]=bug&label_name[]=P2&label_name[]=S1) | [2](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=Quality&label_name[]=bug&label_name[]=P2&label_name[]=S2) | [8](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=Quality&label_name[]=bug&label_name[]=P2&label_name[]=S3) | [1](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=Quality&label_name[]=bug&label_name[]=P2&label_name[]=S4) | 1
~P3 | [0](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name%5B%5D=Quality&label_name%5B%5D=bug&label_name%5B%5D=P3&label_name%5B%5D=S1) | [0](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name%5B%5D=Quality&label_name%5B%5D=bug&label_name%5B%5D=P3&label_name%5B%5D=S2) | [7](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name%5B%5D=Quality&label_name%5B%5D=bug&label_name%5B%5D=P3&label_name%5B%5D=S3) | [1](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name%5B%5D=Quality&label_name%5B%5D=bug&label_name%5B%5D=P3&label_name%5B%5D=S4) | 3
~P4 | [0](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name%5B%5D=Quality&label_name%5B%5D=bug&label_name%5B%5D=P4&label_name%5B%5D=S1) | [0](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name%5B%5D=Quality&label_name%5B%5D=bug&label_name%5B%5D=P4&label_name%5B%5D=S2) | [2](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name%5B%5D=Quality&label_name%5B%5D=bug&label_name%5B%5D=P4&label_name%5B%5D=S3) | [7](https://gitlab.com/gitlab-org/gitlab-ce/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name%5B%5D=Quality&label_name%5B%5D=bug&label_name%5B%5D=P4&label_name%5B%5D=S4) | 1
`no priority` | 1 | 6 | 19 | 5 | 145

Story points: 10.0