Support On Demand Release Evidence
### Problem to solve
<!-- What problem do we solve? -->
The general problem of changing evidence (issues, milestones) can be solved simply with on-demand Evidence collection. In this scenario Releases would have many Evidence objects (`has_many`).
### Intended users
<!-- Who will use this feature? If known, include any of the following: types of users (e.g. Developer), personas, or specific company roles (e.g. Release Manager). It's okay to write "Unknown" and fill this field in later.
* [Rachel (Release Manager)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#rachel-release-manager)
* [Parker (Product Manager)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#parker-product-manager)
* [Delaney (Development Team Lead)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#delaney-development-team-lead)
* [Sasha (Software Developer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sasha-software-developer)
* [Presley (Product Designer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#presley-product-designer)
* [Devon (DevOps Engineer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#devon-devops-engineer)
* [Sidney (Systems Administrator)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sidney-systems-administrator)
* [Sam (Security Analyst)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sam-security-analyst)
* [Dana (Data Analyst)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#dana-data-analyst)
Personas are described at https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/ -->
* [Rachel (Release Manager)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#rachel-release-manager)
* [Delaney (Development Team Lead)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#delaney-development-team-lead)
* [Sasha (Software Developer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sasha-software-developer)
### Further details
<!-- Include use cases, benefits, and/or goals (contributes to our vision?) -->
* Related Comment: https://gitlab.com/gitlab-org/gitlab/issues/38103#note_277327850
### Proposal
<!-- How are we going to solve the problem? Try to include the user journey! https://about.gitlab.com/handbook/journeys/#user-journey -->
**Suggested approach: on-demand Evidence collection**
This issue will implement support for multiple Evidences for a single Release.
An Evidence snapshot may be automatically created, depending on the type of Release. A Release can be created with a historical date, no date or a future date.
- Historical Release (`released_at` date is before current time) - No Evidence is created.
- Immediate Release (no released_at date is provided, Release is created immediately). A single Evidence object is created
- Upcoming Release (`released_at` is a future date) - Evidence is created immediately, and a second Evidence object is schedule to be created at the time of Release.
Additionally Evidence can be created "on-demand". An API endpoint will be provided to create Evidence 'now' (via async Sidekiq job). Multiple evidences are displayed on the Release page, along with the collected_at date (same as created_at).
On the UI, multiple items will be displayed under evidence collection, with the timestamp it was collected at, Updated and version tag in the download link.

### Permissions and Security
<!-- What permissions are required to perform the described actions? Are they consistent with the existing permissions as documented for users, groups, and projects as appropriate? Is the proposed behavior consistent between the UI, API, and other access methods (e.g. email replies)?-->
### Documentation
<!-- See the Feature Change Documentation Workflow https://docs.gitlab.com/ee/development/documentation/feature-change-workflow.html
Add all known Documentation Requirements here, per https://docs.gitlab.com/ee/development/documentation/feature-change-workflow.html#documentation-requirements
If this feature requires changing permissions, this document https://docs.gitlab.com/ee/user/permissions.html must be updated accordingly. -->
* [Release evidence at end date history](https://gitlab.com/gitlab-org/gitlab/issues/38103)
### 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. -->
* Release evidence is captured at any point in time by users
### What is the type of buyer?
<!-- Which leads to: in which enterprise tier should this feature go? See https://about.gitlab.com/handbook/product/pricing/#four-tiers -->
* Premium+
issue
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