feat: allow property filter custom forms to submit tokens

[ernst-dev]

Description

Adds a submit callback to the props passed to Property Filter custom operator forms, letting a custom form apply its value as a filtering token programmatically — for example, on the Enter key. This resolves #3562: the standard Input does not submit the property filter form on Enter by itself, and previously there was no way to trigger submission from within the customizable JSX.

What changed

• PropertyFilterProps.ExtendedOperatorFormProps now includes an optional submit?: () => void. Custom forms call it to apply the current value (the last value propagated via onChange), equivalent to activating the built-in "Apply" action.
• The callback is wired into both custom-form render sites:
  • the filtering dropdown flow (property-editor → internal), reusing the same token-apply logic as the dropdown footer's Apply button;
  • the token editor flow (token-editor → token-editor-inputs), triggering the editor's existing submit.
• The components-package operator/property types (ExtendedOperator, FilteringProperty) are locally augmented to reference the extended form renderer, so inline operators: [{ form }] definitions receive submit with correct typing. This follows the existing // TODO: replace with … from collection-hooks once released convention in property-filter/interfaces.ts (mirrors PropertyFilterFreeTextFiltering). The underlying request ultimately belongs in @cloudscape-design/collection-hooks.

Backward compatibility: submit is optional and additive. Existing custom forms that ignore it are unaffected (regression-guarded by a unit test).

Related links, issue #, if available: #3562 (internal: AWSUI-60879)

How has this been tested?

• New unit tests in property-filter-extended-operators.test.tsx covering: submit availability in the dropdown flow; applying a token via a custom submit button and via the Enter key in the dropdown flow; applying edits from the token editor; and a backward-compatibility guard for forms that never call submit.
• Added a dev page pages/property-filter/custom-form-submit.page.tsx demonstrating a Cloudscape Input that submits on Enter.
• npm run quick-build (TypeScript compile) — green.
• eslint on all changed files — green (0 errors).
• Full property-filter unit suite — 350/350 passing; documenter API snapshot regenerated.

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.61%. Comparing base (f97729a) to head (4a895d3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4808   +/-   ##
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  Coverage   97.61%   97.61%           
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  Files         952      952           
  Lines       30816    30817    +1     
  Branches    11318    11317    -1     
=======================================
+ Hits        30081    30082    +1     
- Misses        688      728   +40     
+ Partials       47        7   -40     

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