Issue #3592934: Add 07-content-contact webform functional coverage

Adds the 07-content-contact functional suite (17 scenarios), all passing on a fresh Varbase install:

• Contact Us Canvas page: all fields incl. Subject, required markers, Industry options, performance budget.
• Business Contact webform interaction on /contact-us (fields, selects, international phone, character counter).
• Newsletter Subscribe: scenarios add the webform to the Home and Contact Us Canvas pages via Canvas's authoring API and publish, then verify the rendered form and the back-end submission.
• No /form/ routes are used.

Reusable steps added: an intl-tel-input phone step, and a step that adds a Webform block to a Canvas page and publishes it via the Canvas API (the editor drag-and-drop is not browser-automatable).

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AI-Generated: Yes (Used Claude Code to draft the Gherkin scenarios and the custom steps. All scenarios were executed and pass; the contributor reviewed the changes and remains responsible for their integrity.)

Checkpoints

• File an issue about this project
• Addition/Change/Update/Fix to this project
• Testing to ensure no regression
• Automated unit/functional testing coverage
• Developer Documentation support on feature change/addition
• User Guide Documentation support on feature change/addition
• UX/UI designer responsibilities
• Accessibility and Readability
• Code review from 1 Varbase core team member
• Full testing and approval
• Credit contributors
• Review with the product owner
• Update Release Notes
• Release