feat: define which keyring methods Portfolio can call

[danroc]

Description

This PR adds a special case for Portfolio to allow it to call submitRequest and getAccountsBalances methods of a keyring Snap needed to support the BTC Snap, alongside other management methods (listAccounts and getAccount).

Related issues

Resolves: https://github.com/MetaMask/accounts-planning/issues/506

Manual testing steps

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.66%. Comparing base (7b69e3c) to head (1c3d3db).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #25633   +/-   ##
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  Coverage    69.66%   69.66%           
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  Files         1366     1366           
  Lines        48215    48215           
  Branches     13301    13301           
========================================
  Hits         33588    33588           
  Misses       14627    14627           

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[metamaskbot]

Builds ready [1c3d3db]

• builds: chrome, firefox
• builds (beta): chrome
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• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
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Page Load Metrics (170 ± 182 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	62	540	121	98	47
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		domInteractive	9	242	39	49	24

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 189 Bytes (0.01%)
• ui: 0 Bytes (0.00%)
• common: 0 Bytes (0.00%)