Updating Embed URLs to Strip Trailing Slashes

[alpinealex]

Description

Fixes #12664.

Updating oEmbed URLs to have the trailing slash stripped from them to prevent the "Sorry, we could not embed that content." when the url is actually a valid embeddable URL.

How has this been tested?

Manually - Adding new embed blocks to the page and testing different valid and invalid embed urls, with and without trailing slashes to ensure behavior still works as expected

Types of changes

Bug fix (non-breaking change which fixes an issue): #12664

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.

[notnownikki]

I'd rather this removed the trailing slash if the embed failed, just so we can support embed URLs that do end with a trailing slash. That should be easy enough to do in componentDidUpdate.

Also, please add an e2e test for the behaviour :)

[alpinealex]

@notnownikki That makes sense. I'll give it a go and push an update once its ready.

[gziolo]

@alpinealex do you plan to revisit this PR? It has been almost 2 months since the last update.

[arod2634]

@gziolo I don't think I'll be able to get to this anytime soon. Feel free to pass on to someone else if there is desired.

[gziolo]

Thanks for your time invested to fix this issue. I will close this PR to let someone else take it as a starting point and open their own branch. Feel free to reopen and continue when you find some time for it 👍