test(flow): cover shared rack firmware inputs

[kunzhao-nv]

Rack firmware callers can pass one shared SOT instead of repeating it for each tray type. This PR documents that existing behavior, adds Flow parent/child workflow coverage for shared and per-type inputs, and regenerates the SDK comments and API reference. Request fields and runtime behavior are unchanged.

For PATCH /v2/org/{org}/nico/rack/{id}/firmware, these requests are equivalent when the same SOT applies to all selected tray types. SOT contents below are abbreviated for illustration.

Before: repeat the same SOT in a per-type mapping.

{
  "siteId": "550e8400-e29b-41d4-a716-446655440000",
  "version": "{\"compute\":{\"Id\":\"fw-default\"},\"nvswitch\":{\"Id\":\"fw-default\"},\"powershelf\":{\"Id\":\"fw-default\"}}"
}

After: use the shared form clarified by this PR. This form already works on main; it does not require a new flag.

{
  "siteId": "550e8400-e29b-41d4-a716-446655440000",
  "version": "{\"Id\":\"fw-default\"}"
}

Flow passes the shared string unchanged to each selected tray type. A top-level compute, nvswitch, or powershelf key selects the per-type form. A missing key in that form passes an empty input to the backend; it does not guarantee a skipped update.

Related issues

None.

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

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