feat: Update swagger to openapi 3.0.4, update request payloads with examples (#11533)

# Pull Request Template

## Description

Updates the public swagger spec to be OpenAPI 3.0.4 compliant. Regarding
#7893, I'm investigating the use of
[oas_rails](https://github.com/a-chacon/oas_rails) to auto-generate the
documentation along with correct expected payloads.
Mostly fixes #10531, related to #7893

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality not to work as expected)
- [ ] This change requires a documentation update

## How Has This Been Tested?

Copied spec into swagger editor, reviewed outputs:

![openapi](https://github.com/user-attachments/assets/bd43f895-74bb-4373-ba6d-c5b190b699dd)

Note that this shows two errors with the `DELETE` endpoints as
technically these should not have a `requestBody` - in which case we
should be making use of another HTTP verb or another endpoint.

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Daniel Jimenez <devildan.knex@gmail.com>
Co-authored-by: Daniel Jimenez <daniel.jimenez@spark64.com>

Gemfile

@@ -33,6 +33,8 @@ gem 'liquid'
 gem 'commonmarker'
 # Validate Data against JSON Schema
 gem 'json_schemer'
+# used in swagger build
+gem 'json_refs'
 # Rack middleware for blocking & throttling abusive requests
 gem 'rack-attack', '>= 6.7.0'
 # a utility tool for streaming, flexible and safe downloading of remote files
@@ -196,9 +198,6 @@ group :development do
   gem 'scss_lint', require: false
   gem 'web-console', '>= 4.2.1'
 
-  # used in swagger build
-  gem 'json_refs'
-
   # When we want to squash migrations
   gem 'squasher'