[core-data]: Fix TS types for user object

[manzoorwanijk]

This PR solves two issues

1. The core-data getCurrentUser selector's return type is set to ET.User< 'edit' >, which sets the incorrect return type with properties that don't exist on the current user object, for example, user.capabilities. The return type should rather be ET.User< 'view' > because that is what state.currentUser is, as mentioned in Convert core-data selectors from jsDoc annotations into TypeScript type signatures #40025 (comment)

Here, you can see the difference between a current user (users/me) and a normal user (users/<id>) object.

2. The type for user.capabilities is set to Record< string, string >, which is incorrect. It should rather be Record< string, boolean >, because those capabilities come from here as pointed out in Core Data: TypeScript definitions for entity records. #38666 (comment)

What?

• Fix the return type for getCurrentUser selector.
• Fix the type for user.capabilities to be a record of booleans instead of a record of strings.

Why?

To fix the incorrect types

How?

By fixing the types

Testing Instructions

• There is nothing really to test, you can just proof read and verify the behavior from REST API documentation.

Testing Instructions for Keyboard

Screenshots or screencast

Before	After

[github-actions]

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[github-actions]

Flaky tests detected in 6e61661.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/16372596563
📝 Reported issues:

• [Flaky Test] should show the original content after revert, clicking undo then redo in the header toolbar #47896 in /test/e2e/specs/site-editor/template-revert.spec.js