Update licensing.md to remove Cloud trial link

[iskyOS]

Removing old Sourcegraph Cloud trial link

[github-actions]

Warning

As we're migrating to Notion, we want to make sure that changes to the handbook are absolutely necessary. To ensure it is the case, it's now mandatory to get an approving review to merge a pull request.

Examples

• Setting up a redirection to a Notion page: PR will be approved.
• Correcting an important mistake on a page that doesn't have an equivalent yet: PR will be approved.
• Updating content that isn't mission critical: PR will be rejected.

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[sourcegraph-bot]

Notifying subscribers in CODENOTIFY files for diff 5119978...a7d4349.

Notify	File(s)
@sqs	content/departments/product/process/gtm/licensing.md

[iskyOS]

@madisongclark This may not be mission critical -- just trying to delete a link to an old subdomain, signup.sourcegraph.com, that we're taking down. I've also removed it on the notion side.

[madisongclark]

Thanks for also updating in Notion, @iskyOS.