Prevent adding form keys to forms with external action URLs

[krzksz]

Description (*)

This issue fixes the case where form_key field was being added to POST forms that had external (not belonging to shop's base URL) action URL.

Fixed Issues (if relevant)

1. form_key parameter gets added to all forms #23382: form_key parameter gets added to all forms

Manual testing scenarios (*)

1. Prepare a static block with following text content (with editor disabled):

<form action="https://google.com" method="POST"><input type="submit" value="Submit test form"></form>

2. Add above static block to any CMS page.
3. Go to the CMS page, open developer tools under Network tab with Preserve log checkbox checked.
4. Click Submit test form button and verify that no form_key field was added to request parameters.

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)

[m2-assistant]

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[krzksz]

@magento give me test instance

[magento-engcom-team]

Hi @krzksz. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @krzksz, here is your new Magento instance.
Admin access: https://pr-25336.instances.magento-community.engineering/admin
Login: admin Password: 123123q

[magento-engcom-team]

Hi @VladimirZaets, thank you for the review.
ENGCOM-6199 has been created to process this Pull Request

[engcom-Bravo]

✔️ QA Passed

[engcom-Golf]

@magento run all tests

[m2-assistant]

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