Epic Fuzz testing results in MR widget - Coverage guided fuzz testing
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### Problem to solve
Fuzz testing provides lots of valuable information to users in terms of ways to crash the app. Currently, it is difficult for them to access this information since it is buried in individual pipeline results, rather than in other screens they regularly interact with, such as the Merge Request widget.
### Intended users
* [Sasha (Software Developer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sasha-software-developer)
* [Simone (Software Engineer in Test)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#simone-software-engineer-in-test)
### Further details
### Design 1 - MR Widget bar + expanded info (In scope if https://gitlab.com/gitlab-org/gitlab/-/issues/12896 is NOT done)
**When implement it in an old MR widget**
| Old MR widget collapsed | Old MR widget expanded |
| ------------------ | ----------- |
| https://www.figma.com/file/ckuKpzAUe7M0iAF9NdnDQl/Fuzz-testing-MR-page?node-id=4%3A0 |https://www.figma.com/file/ckuKpzAUe7M0iAF9NdnDQl/Fuzz-testing-MR-page?node-id=1%3A2|
| We contribute the number if we can tell the findings are new or not | Download artefacts available from this page, rest is the same as other scanners |
|||
### Design 2 - MR Widget bar (In scope if https://gitlab.com/gitlab-org/gitlab/-/issues/12896 is done)
**When implement it in a one new MR widget**
| New MR widget collapsed | New MR widget leads to a new tab |
| ------------------ | ----------- |
|https://www.figma.com/file/ckuKpzAUe7M0iAF9NdnDQl/Fuzz-testing-MR-page?node-id=3%3A142| https://www.figma.com/file/ckuKpzAUe7M0iAF9NdnDQl/Fuzz-testing-MR-page?node-id=3%3A1236|
| We contribute the number if we can tell the findings are new or not| |
|  | |
### Design 3 - Finding Modal (Definetely in scope)
**No matter old or new MR widget, the modal window details keep the same**
| Coverage guide - collapsed | Coverage guide - expanded |
| ------------------ | ----------- |
| https://www.figma.com/file/ckuKpzAUe7M0iAF9NdnDQl/Fuzz-testing-MR-page?node-id=4%3A2 |https://www.figma.com/file/ckuKpzAUe7M0iAF9NdnDQl/Fuzz-testing-MR-page?node-id=78%3A1092|
| |https://www.figma.com/file/ckuKpzAUe7M0iAF9NdnDQl/Fuzz-testing-MR-page?node-id=80%3A0 |
| we only show 6 lines of stack trace | we only keep one scroll bar of the modal window |
|  |   |
- :movie_camera: Video walkthrough: https://youtu.be/rKX1MJsHFCo
### Permissions and Security
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### Documentation
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### Availability & Testing
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What risks does this change pose to our availability? How might it affect the quality of the product? What additional test coverage or changes to tests will be needed? Will it require cross-browser testing?
Please list the test areas (unit, integration and end-to-end) that needs to be added or updated to ensure that this feature will work as intended. Please use the list below as guidance.
* Unit test changes
* Integration test changes
* End-to-end test change
See the test engineering planning process and reach out to your counterpart Software Engineer in Test for assistance: https://about.gitlab.com/handbook/engineering/quality/test-engineering/#test-planning -->
### What does success look like, and how can we measure that?
<!-- Define both the success metrics and acceptance criteria. Note that success metrics indicate the desired business outcomes, while acceptance criteria indicate when the solution is working correctly. If there is no way to measure success, link to an issue that will implement a way to measure this. -->
Add usage ping to record the number of times users view the fuzz testing results.
### What is the type of buyer?
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### Is this a cross-stage feature?
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### Links / references
### Implementation Strategy
#### Frontend
| Tasks # | Description | ~frontend issue | ~frontend weight |
| ----------- | -------------------------------------------------------------- | ---------------------------------------------------- | ---------------------- |
| 1 | Fuzz testing results in MR widget - Coverage guided fuzz testing - Update getters to reflect updated summary counts| https://gitlab.com/gitlab-org/gitlab/-/issues/254637 | ~"frontend-weight::2" |
| 2 | Fuzz testing results in MR widget - Coverage guided fuzz testing - Render fuzzing report section in MR widget| https://gitlab.com/gitlab-org/gitlab/-/issues/251017 | ~"frontend-weight::2" |
| 3 | Fuzz testing results in MR widget - Coverage guided fuzz testing - Render fuzz related vuln data in modal| https://gitlab.com/gitlab-org/gitlab/-/issues/254650 | ~"frontend-weight::3" |
| 4 | Fuzz testing results in MR widget - Coverage guided fuzz testing - Add artifact download dropdown| https://gitlab.com/gitlab-org/gitlab/-/issues/254711 | ~"frontend-weight::3" |
| 5 | Fuzz testing results in MR widget - Coverage guided fuzz testing - Docs| https://gitlab.com/gitlab-org/gitlab/-/issues/254652 | ~"frontend-weight::2" |
## Follow-up Frontend
Remove Feature Flag - https://gitlab.com/gitlab-org/gitlab/-/issues/257839
#### Backend
| Tasks # | Description | ~backend issue | ~backend weight |
| ----------- | -------------------------------------------------------------- | ---------------------------------------------------- | ---------------------- |
| 1 | Fuzz testing results in MR widget - Coverage guided fuzz testing - Implement coverage fuzzing report endpoint for Mr widget | https://gitlab.com/gitlab-org/gitlab/-/issues/255169 | TBD |
epic