Add command: Manage categories while Editing a category template

[karthick-murugan]

What?

Enhancement for the Editing a category template mentioned in #50407

Why?

Currently there is no command to manage categories while editing category templates.

How?

This PR adds adds "Manage Categories" command by default when the command palette is opened while editing category templates.

Testing Instructions

• Log in to your WordPress dashboard.
• Navigate to the Site Editor.
• Click on Templates from the left panel.
• The main section will display a list of all available templates.
• Select the "All Archives" template, or any Category or Tag template you wish to edit.
• The editor panel for the selected template will open.
• Open the Command Palette by either pressing Cmd + K (on macOS) or using the command palette icon at the top.
• The "Manage Categories" or "Manage Tags" command will appear by default.
• This command will not appear for any other templates other than category or tag templates.
• Click on the displayed command to be redirected to the respective management page (Categories or Tags) in the WordPress dashboard.

Screenshots or screencast

REC-20241115165442.mp4

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: karthick-murugan <[email protected]>
Co-authored-by: carolinan <[email protected]>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[carolinan]

@karthick-murugan I don't believe this is the correct way to determine if we are in the Site Editor.
When I search the code base, the common method I see is:

const isSiteEditor = getPath( window.location.href )?.includes(
	'site-editor.php'
);

[karthick-murugan]

@carolinan - Updated the common method as per your advice. Thanks.