[#4789] add step-wise editing for banks view of partner profile

[danielabar]

Resolves #4789

Description

Similar to the 4504 work, this modifies the bank's view of editing a partner profile to also be a step-wise, using Bootstrap Accordion. Fortunately all the same partials that were introduced for partner profile can be re-used here.

Type of change

New feature/follow-on.

How Has This Been Tested?

Automated tests added at spec/system/partner_system_spec.rb, see describe "#edit_profile" do.

For manual testing:

Start by enabling the feature flag in a Rails console bin/rails c:

Flipper.enable(:partner_step_form)

1. Login as org admin
2. From left nav, select Partner Agencies -> All Partners
3. Click on any Partner name
4. From the Partner Profile information (you might need to scroll down a bit to get to this section), click on "Edit Information"
5. You should be on the partner profile edit view with all sections in a closed accordion state (see screenshots section)
6. Functionality is the same as what was done in 4504 (including error handling). Except clicking Save and Review will navigate to the banks Partner Profile view at for example: http://localhost:3000/partners/8#partner-information

Screenshots