feat(snaps-rpc-methods)!: update usage of withKeyring to withKeyringV2Unsafe

[hmalik88]

This PR updates usage of withKeyring to the new withKeyringV2. The plan is to convert withKeyringV2 to be withKeyring once usage across the codebase has been converted to v2.

---

Note

Medium Risk
Touches messenger paths that read HD keyring mnemonic/seed for Snap entropy RPCs; logic is unchanged but clients must expose the new action or entropy methods will fail at runtime.

Overview
This PR replaces all KeyringController:withKeyring messenger usage with KeyringController:withKeyringV2Unsafe as part of the broader KeyringController v2 migration.

In @metamask/snaps-rpc-methods, the shared type is renamed to KeyringControllerWithKeyringV2UnsafeAction, and entropy-related restricted methods (snap_getEntropy, snap_getBip32*, snap_getBip44Entropy) declare and call the new action. getMnemonic / getMnemonicSeed in utils.ts now invoke withKeyringV2Unsafe for primary and alternate entropy sources. Tests and Unreleased changelog entries are updated accordingly.

@metamask/snaps-simulation registers a mock handler for withKeyringV2Unsafe instead of withKeyring. snaps-controllers only updates a comment on WithSnapKeyringFunction to document the v2 unsafe API.

Behavior is intended to stay the same; this is primarily an integration rename so Snaps align with the new KeyringController surface before withKeyringV2 becomes the default withKeyring.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.58%. Comparing base (7998f0d) to head (408113b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4009   +/-   ##
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  Coverage   98.58%   98.58%           
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  Files         425      425           
  Lines       12370    12370           
  Branches     1949     1949           
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  Hits        12195    12195           
  Misses        175      175           

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[FrederikBolding]

Suggested change

	- Update `withKeyring` to `withKeyringV2Unsafe` ([#4009](https://github.com/MetaMask/snaps/pull/4009))
	- Use `withKeyringV2Unsafe` for accessing entropy ([#4009](https://github.com/MetaMask/snaps/pull/4009))

[FrederikBolding]

Suggested change

	- Update `withKeyring` to `withKeyringV2Unsafe` ([#4009](https://github.com/MetaMask/snaps/pull/4009))
	- **BREAKING:** Use `withKeyringV2Unsafe` for accessing entropy ([#4009](https://github.com/MetaMask/snaps/pull/4009))

[FrederikBolding]

I would just revert this

[FrederikBolding]

Looks like type was changed, we use that for filtering, but also assert it below.

Please adjust tests as well.

[FrederikBolding]

Though it seems that KeyringController expects a V1 type for filtering but then returns V2 when using withKeyringV2. Unsure if that is a bug that needs fixing first?