Use Jetpack Redirects in blocks links

[leogermani]

Updates #15350

Replaces hard-coded links with links to use the Jetpack Redirect service.

Still have to check this issue raised by @kraftbj -> #15403 (comment)

Changes proposed in this Pull Request:

• Replaces hard-coded links with links to use the Jetpack Redirect service.

Jetpack product discussion

#15403

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

No

Testing instructions:

• Test the affected blocks
• Check that sources uses in the Redirects exist in the Redirect manager and point to the right place

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Jetpack plugin:

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[jeherve]

Since some of those links were hardcoded in tests, you'll need to update tests as well before we can merge this.