Fix forms generator bugs

[britneywwc]

Note: form template usage document should be updated once this is merged

Done

• Add exception checks when rendering form template
• Use form template on /data/postgresql modal
• Added and placeholder for textarea
• Added exception to remove contact us formfield with id=about-you to be excluded from Comments_from_lead__c
• Remove unused modal.js file
• Apply form modal design as approved by Visual team (similar to https://ubuntu.com/aws#get-in-touch)
• Add inputType fields to forms-data.json to accept params: radio, checkbox, checkbox-visibility

QA

• Go to https://canonical-com-1443.demos.haus/data/postgresql
• Check that secondary navigation is showing (reported bug Form handling is causing secondary nav to disappear #1399)
• Click on "Get in touch"
• Modal should pop up
• Check that the formfields are similar to prod https://canonical.com/data/postgresql#get-in-touch
• Check that "Tell us about your use case" textarea has aria label and placeholder text
• Fill up form, submit and see that Comments_from_lead__c only includes the comments from "Tell us about your use case" text area

Issue / Card

Fixes WD-17343 and #1399

Screenshots

[if relevant, include a screenshot]

[webteam-app]

Demo

Jenkins

demos.haus

[petesfrench]

The design of the form has changed, is this intentional?
Also there seem to be a lack of white space above the form heading
Current:

Old:

[petesfrench]

keep in mind that on ubuntu.com we use the modal id to fetch the modal in dynamic-forms.js and on c.com we use the .p-modal class. We should be trying to align the scripts for a future merge (not saying this is wrong at all)

[britneywwc]

I'm unsure if there were any previous discussions with Design regarding the form design changes, this was the design shown when I imported the form templates.
@mattea-turic @lyubomir-popov could you guys please weigh in on this? Should we update the form template to reflect the old form design or is the current one fine?

[lyubomir-popov]

Hi, the "old" version is what was designed by visual. The "current version" looks like something that has not undergone visual. Can we simply implement this as agreed? From my records, this is the final template, with a "ready for dev" label on it. Complete with responsive mockups for smaller screens.

[petesfrench]

LGTM!

Just one q, why is there now a 'how many machines?' question in the form?

[britneywwc]

Thanks for the +1 @petesfrench! I will remove that field before merging, it was added just for QA purposes :)