DOP-4283: Add buttons for lab drawer

[rayangler]

Stories/Links:

DOP-4283

Current Behavior:

Server prod

Staging Links:

Server staging with feature flag ON - with drawer
Server staging with feature flag ON - no drawer

The following should load similar to the current behavior:
Server staging with feature flag OFF
Server staging with feature flag OFF

Notes:

• Main focus of this PR is to add the buttons needed for the lab drawer, update leftover styling for the drawer, and update tests.
• There were a few changes in plans in both the code and original A/C (see my comments below). This shouldn't affect the implementation too much.
• To test locally, ensure you have the GATSBY_FEATURE_LAB_DRAWER frontend feature flag set to true, and pull in the latest changes of the parser to parse a page with an instruqt directive with the drawer option. For example:

.. instruqt:: /mongodb-docs/tracks/example?token=example
   :title: Example Lab
   :drawer:

[rayangler]

I had to move this away from RootProvider because the isOpen state was being preserved when switching between pages. Moving it to DocumentBody ensures that values are reset between pages since every page has its own instance of the DocumentBody component, rather than the shared behavior of the RootProvider in the layout components.

An alternative solution was to use a useEffect in the Instruqt context to set the state back to default whenever the page slug prop changed value, but it seemed like unnecessary logic at the root level when the context could have just been brought down to the page level. Please let me know if there's a preference though!

[anabellabuckvar]

This makes sense to me!

[rayangler]

Originally, this was supposed to open the Instruqt lab in a new tab, but it turns out I made a mistake during the initial investigation of how lab progress was saved. Tl;dr is that lab progress does not seem to be saved between tabs when the labs are started on different origins (MongoDB vs. Instruqt). Instead, we'll go with the alternative of setting the height of the drawer to its maximum.

If we figure out how to safely preserve lab progress between tabs from different site origins, it should be low effort to readjust this button. Otherwise, I'll go ahead and add a comment to the ticket to reflect these recent findings and this change in functionality accordingly

[seungpark]

LGTM. minor comment on what the maximize button would do when the drawer is already maximized. CMIIW but seems like design was not updated either