Ensure all Podcast terms show in the editor sidebar

[dkotter]

Description of the Change

As reported in #267, only 10 Podcast terms currently show in the Block Editor sidebar panel. In looking into this, seems we introduced a custom component to render these terms in #232, in order to have a nicer experience when adding new Podcasts from the sidebar.

The code for this uses getEntityRecords to get the Podcasting terms. The problem here is by default this will only query for the last 10 items. For sites that have more than 10 Podcasting terms set up, not all of those will end up showing.

This PR fixes that by adding some default query params to the getEntityRecords call to ensure we return more terms. This matches what we are doing in assets/js/term-selector/hierarchichal-term-selector.js.

Closes #267

How to test the change

1. Check out the develop branch
2. Add at least 11 Podcast terms
3. Go to a post and notice that only 10 Podcast terms are showing
4. Checkout this PR
5. Go to a post and notice all Podcast terms are now showing

Changelog Entry

Fixed - Ensure we show all Podcasting terms in the Block Editor sidebar

Credits

Props @dkotter, @channchetra

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

[Sidsector9]

Code looks good and tests well 👍