taxonomy-controls.js: Change REST context to "view" when fetching taxonomy terms.

[drzraf]

What?

taxonomy-controls.js: Change REST context to "view" when fetching taxonomy terms.

Why?

When the query-loop block is used for a post type and a custom taxonomy exists but edit_terms permission isn't granted,
the following request is issued /wp-json/wp/v2/my_taxonomy?per_page=100&context=edit resulting in a 403 and keeping the
taxonomy selector to appear although it's just a read operation on terms.

How?

Changing getEntityRecords( 'taxonomy', slug, termsQuery ); to pass context=view

Testing Instructions

1. Create a new, restricted taxonomy, associated with post having particular permissions:

                'capabilities'      => [
                    'manage_terms' => '',
                    'edit_terms'   => '',
                    'delete_terms' => '',
                    'assign_terms' => 'edit_posts',
                ],

2. Open a Post or Page
3. Insert a Query Loop
4. The taxonomy does not appear without this change.

Somehow related

Not unlike #37368 or #33569 and related to #33003 / #37489

[ntsekouras]

Looks good, thank you @drzraf! With green CI let's 🚢

[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @drzraf! In case you missed it, we'd love to have you join us in our Slack community, where we hold regularly weekly meetings open to anyone to coordinate with each other.

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[github-actions]

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