Add metadata file to blogging-prompt and business-hours blocks

[monsieur-z]

Proposed changes:

This PR adds a block.json metadata file to the blogging-prompt and business-hours blocks and updates the build so that these files are copied over to the build folder.

This is an attempt to see if wp.org will parse the metadata file by just including it in a block directory.

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

pedMtX-RS-p2

Does this pull request change what data or activity we track or use?

No.

Testing instructions:

TBD

[github-actions]

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• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta > Jetpack and enable the add/blocks-metadata-file branch.

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[github-actions]

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Jetpack plugin:

• Next scheduled release: August 23, 2023.
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[kraftbj]

Could we split the work to utilize the block.json from the block.json addition themselves? I'm not sure why the meta dir things are needed for first step of having visibility in w.org?

[monsieur-z]

I'm not sure why the meta dir things are needed for first step of having visibility in w.org?

It was required to test the registering approach, but since just including the metadata file in the directory works, no need for it indeed. We'll work in new PRs.

[monsieur-z]

For reference:
#32431
#32426
#32432
#32433