Custom Content Shortcode: Support Signed Subscriber IDs

[n7studios]

Summary

Fixes this reported issue by calling the profiles method to determine which tags the subscriber has access to when a signed subscriber ID is used.

Testing

• testCustomContentShortcodeWithValidTagParameterAndInvalidSignedSubscriberID: Test the [convertkit_content] shortcode works when a valid Tag ID is specified and an invalid signed subscriber ID is used who is subscribed to the tag.
• testCustomContentShortcodeWithValidTagParameterAndValidSignedSubscriberID: Test the [convertkit_content] shortcode works when a valid Tag ID is specified, and a valid signed subscriber ID is used who is subscribed to the tag.

Checklist

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

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