Fix emails sent out on generation

[chihsuan]

All Submissions:

• [x] Have you followed the Contributing guidelines?
• [x] Does your code follow the WordPress' coding standards?
• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Closes #97.

This PR disables the sending emails when generating objects via UI

How to test the changes in this Pull Request:

1. Use a site with PHP > 8.0 (require minimum php version)
2. Install WooCommerce and wc-smooth-generator
3. Go to Tools > WooCommerce Smooth Generator
4. Generate some order
5. Go to your email app and observe that no "New order..." emails received.

Please also test CLI

• Run wp wc generate orders 1
• Run wp wc generate customers 1

Other information:

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [ ] Have you written new tests for your changes, as applicable?
• [ ] Have you successfully run tests with your changes locally?

Changelog entry

Enter a summary of all changes on this Pull Request. This will appear in the changelog if accepted.

Fix emails sent out on generation

FOR PR REVIEWER ONLY:

• [ ] I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.

[chihsuan]

It seems the customer email still gets generated when using the UI. This is triggered by generating orders. I tested this in a JN.

Thanks @ilyasfoo I just confirmed this. 🙇‍♂️ Looks like they went to Spam, so I wasn't aware of it. I've fixed it in 41356eedd38a5badc6d002a7a3f60dc594225846.

[chihsuan]

Thanks, now I'm not seeing any emails with the UI. LGTM, but note that I can't test with CLI 🪨

I've tested with CLI again on my JN site. Confirmed no emails were sent to my inbox.