[Issue] Fix issues with Customer Data when form contains element with name `method`

[m2-assistant[bot]]

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This issue is automatically created based on existing pull request: magento/magento2#38449: Fix issues with Customer Data when form contains element with name method

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Description (*)

The path to verify <form method=""> value in customer-data.js (Magento_Customer) is glitchy and when there's an element with name="method" in the submitted form, the event.target.method refers to element, not attribute.

Related Pull Requests

Fixed Issues (if relevant)

Please create one.

Manual testing scenarios (*)

1. Open any form (e.g. Customer Registration form),
2. Open Browser console and replace name="" of any element (e.g. "Remember me") to name="method".
3. Set breakpoint at customer-data.min.js line after $(document).on('submit', function(event) {.
4. Expect that if () section (1 line below) uses <form method=""> - not just created element.

Questions or comments

We noticed the issue while troubleshooting Paradoxlabs Firstdata extension issues.

CC @rhoerr

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)
• [ ] README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• [ ] All automated tests passed successfully (all builds are green)