Add setoptions to Marketo forms

## Overview

Relates to https://gitlab.com/gitlab-org/customers-gitlab-com/-/issues/1604#note_368526638

#### Briefly describe your request
What is going to be added/removed, etc.

Per [this recommendation](https://nation.marketo.com/t5/Product-Blogs/Really-finally-winning-the-Marketo-Forms-vs-Tracking-Protection/ba-p/244434), add the following code to our Marketo forms and QA to verify the impact.

```
MktoForms2.setOptions(
{
 formXDPath : "/rs/194-VVC-221/images/marketo-xdframe-relative.html"
});
```

#### Describe why this update is being requested:
What problem(s) are you trying to solve? What are the goals?

Improve the behavior of privacy-enhanced web browsers

_________

## Project Management

#### What is the due date AND WHY? Dates without reason are difficult to prioritize. If there is no due date, please be as specific as possible about a timeframe and need.

`No specific due date but the sooner the better since forms directly impact growth.`

#### Please identify the directly responsible individual (DRI), stakeholders, and roles

<!--
Who should we be asking for questions and reviews?
-->

|Name|Role|
|------|------|
| `@j.carey` | DRI | 
| `@amy.waller` | Marketo tool lead | 
| `@brandon_lyon` | Marketing web developer |

 ____________

## Audience

#### Who is primarily looking at this page AND what will they they be doing with it/what do we want them to do? Write specifics AND check off below anything relevant

All visitors to about.gitlab.com who interact with a Marketo form

___________
## Promotion and Measurable Goals

#### What are the measurable key performance indicators (KPI)?

* `Form completions`
* `Self-managed trial signups`

___________

## Relevant Documents/Information

* [Marketo form best practices](https://nation.marketo.com/t5/Product-Blogs/Really-finally-winning-the-Marketo-Forms-vs-Tracking-Protection/ba-p/244434)
* [Cookiebot improvements](https://gitlab.com/groups/gitlab-com/-/epics/681).

_____________
## Requestor Checklist

* [x] All sections have been filled out
* [x] All media and relevant documents have been linked or added
* [x] A due date and rationale for the due date has been added
* [x] Your team labels have been added

_____________
## Where to regression test Marketo

* **Preference center `/company/preference-center/`**
* **Self managed trial `/free-trial/self-managed/`**
* **Demo `/demo/`**
* **Sales `/sales/`**
* **Public sector `/solutions/public-sector/`**
* **Renewals `/renewals`**
* All remote `/company/culture/all-remote/`
* Commit event `/events/commit/`
* Education `/solutions/education/`
* Forms with an A/B test `/just-commit/reduce-cycle-time/`
* Resource forms `/resources/whitepaper-DevSecOps-Proactive-security-reduce-risk/`
* Webcast (before recording): `/webcast/gitlab-cicd-firebase/`
* Webcast (after recording): `/webcast/fintech-developer-forum/`
* Developer survey `/developer-survey/`
* Marketo webcast before & after webcast happens `/webcast/fintech-developer-forum/`
* Contact `/company/contact/`
* Blog landing `/blog/`
* Blog category `/blog/categories/open-source/`


Story points: 2.0