Extend createServicePolicy to support live network status (#7164)

## Explanation

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In a future commit we will introduce changes to `network-controller` so
that it will keep track of the status of each network as requests are
made. These updates to `createServicePolicy` assist with that. See the
changelog for more.

Besides this, the tests for `createServicePolicy` have been refactored
slightly so that they are easier to maintain in the future.

## References

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Progresses https://consensyssoftware.atlassian.net/browse/WPC-99.

You can see how these changes will be used in the next PR:
#7166

## Checklist

- [x] I've updated the test suite for new or updated code as appropriate
- [x] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [x] I've communicated my changes to consumers by [updating changelogs
for packages I've
changed](https://github.com/MetaMask/core/tree/main/docs/contributing.md#updating-changelogs),
highlighting breaking changes as necessary
- [x] I've prepared draft pull requests for clients and consumer
packages to resolve any breaking changes

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adds `getCircuitState`, `onAvailable`, and `reset` to `ServicePolicy`,
exports Cockatiel types, and updates logic/tests to support availability
tracking and circuit state introspection.
> 
> - **controller-utils**:
>   - **ServicePolicy API**:
>     - Add `getCircuitState()` to expose underlying circuit state.
> - Add `onAvailable` event for first success and post-recovery success.
>     - Add `reset()` to close the circuit and reset breaker counters.
>   - **Behavior/Internals**:
> - Track availability status and emit `onAvailable`/`onDegraded`
appropriately.
> - Update `onBreak` to mark unavailable; wire `ConsecutiveBreaker` for
reset.
>   - **Exports**:
> - Export `CockatielEventEmitter` and `CockatielFailureReason`;
re-export via `index`.
>   - **Tests**:
> - Expand/refactor tests to cover `onAvailable`, `getCircuitState`,
`reset`, and timing cases; update export snapshot.
>   - **Docs**:
>     - Update `CHANGELOG.md` with new methods and exports.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
e597d0b. This will update automatically
on new commits. Configure
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<!-- /CURSOR_SUMMARY -->

Author: mcmire

packages/controller-utils/CHANGELOG.md

@@ -7,6 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add `getCircuitState` method to `ServicePolicy` ([#7164](https://github.com/MetaMask/core/pull/7164))
+  - This can be used when working with a chain of services to know whether a service's underlying circuit is open or closed.
+- Add `onAvailable` method to `ServicePolicy` ([#7164](https://github.com/MetaMask/core/pull/7164))
+  - This can be used to listen for the initial successful execution of the service, or the first successful execution after the service becomes degraded or the circuit breaks.
+- Add `reset` method to `ServicePolicy` ([#7164](https://github.com/MetaMask/core/pull/7164))
+  - This can be used when working with a chain of services to reset the state of the circuit breaker policy (e.g. if a primary recovers and we want to reset the failovers).
+- Export `CockatielEventEmitter` and `CockatielFailureReason` from Cockatiel ([#7164](https://github.com/MetaMask/core/pull/7164))
+  - These can be used to further transform types for event emitters/listeners.
+
 ## [11.15.0]
 
 ### Added