Add custom added url key to decoded directive string in WYSIWYG editor

[Jeroenll]

Description (*)

Adding an url using a variable will remove a custom added url key when switching between show and hide editor.

Fixed Issues (if relevant)

None I could find.

Manual testing scenarios (*)

1. Open a CMS page and hide the editor so raw html can be inserted.
2. Insert <p><a href="{{config path="web/secure/base_url"}}custom-key">custom</a></p>
3. Click show/hide editor twice and you're back in the raw input mode.
4. Your added custom-key is now removed.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

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[pmclain]

@magento give me test instance

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[pmclain]

@magento give me 2.3-develop instance

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[magento-engcom-team]

Hi @pmclain, thank you for the review.
ENGCOM-5508 has been created to process this Pull Request
✳️ @pmclain, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Alfa]

✔️ QA Passed

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