[FEATURE] Improve Order Form Validation

[danry25]

What is the problem that this feature solves? This will help us collect more accurate data, ensuring it is easier to contact new customers.

It appears we were fuzzed by #Acunetix or a similar software given the content of the form that was submitted through our ordering system (based on this article).

Describe the solution you'd like

• [x] Validate the phone number entered in the Direct Phone Number field is portable
• [x] Unit Type should be required to have a value if the Unit field or Address 2 is filled out
• [x] First Name, Last Name and Business Name should not all have the exact same values

[uncheckederror]

• [x] The install date needs to be at least 1 day in the future.
• [x] When a validation error occurs we need to preserve the state of the checkout form, rather than just bumping them back to their cart.

[uncheckederror]

@danry25 okay, these changes are live. Try them out an tell me what you think.