fix: invalid Optimole URLs being picked up for embed

[abaicus]

All Submissions:

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

Changes proposed in this Pull Request:

• Regex was not properly testing URLs to make sure that we're embedding a video.
• Adds check to ensure we also test for video formats.

How to test the changes in this Pull Request:

1. Use an INVALID Optimole URL from the account with which the webiste is currently connected;
2. Add an image block and paste it as the URL for that respective image;
3. The block should not be automatically transformed to an embed at this point, or after refreshing the page;

Other information:

• 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 ran tests with your changes locally?

[pirate-bot]

Plugin build for 0df4337 is ready 🛎️!

• Download build
• Download dev

[pirate-bot]

🎉 This PR is included in version 4.2.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀