Query Title: Add block example

[aaronrobertshaw]

Part of: #64707
Related: #65430

What?

Adds a block example definition for the Query Title block.

Why?

The Style Book is being iterated on and part of that effort is to ensure the desired blocks are shown there. Currently, this is dependent on blocks having an example defined.

How?

Adds an example to the Query Title block.

Testing Instructions

1. In the editor, open the main block inserter from the top left
2. Search for the Archive Title variation of the Query Title block and hover over it
3. Confirm the preview for the block displays correctly
4. Repeat that for the Search Results Title variation
5. Navigate to the Style Book, (Appearance > Editor > Styles > Style Book icon) and switch to the "Theme" tab.
6. Confirm the Query Title block is displayed here

Screenshots or screencast

Style Book	Archive Title (Inserter)	Search Results Title (Inserter)

[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: aaronrobertshaw <aaronrobertshaw@git.wordpress.org>
Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>

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

[aaronrobertshaw]

I believe the block variations (for Archive and Search Results titles) override the type attribute so they don't need their own custom example definitions within variations.js

[aaronrobertshaw]

Similar to the Post Navigation Link block, we could display the block variations in the Style Book. For now though, I just went with the Search Results Title type for the Style Book example. That can be tweaked later if desired.

[ramonjd]

🚀

Kapture.2024-09-23.at.15.00.33.mp4