Add scroll bars to graph editor background

[AdRiley]

These will be a temporary addition until we come up with a better navigation solution.

Need to think about how the limits work. But I think initial assumption is the size of the graph editor background for the scroll bars is the size of the current workflow.

[farmaazon]

Refinement notes:

• Let's try to make scrollbars not too eye-catching, like in the google docs
• We could make scrollbar extend their range when "overscrolling" (so user could navigate an infinite canvas). But do not invest too much on it.

[AdRiley]

https://www.lucidchart.com/ seems to work reasonably well for the "overscrolling" problem.

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[enso-bot]

Keziah Wesley reports a new STANDUP for today (2024-03-05):

Progress: Mostly working on the events, coordinates, and bounds computation. It should be finished by 2024-03-07.

Next Day: Next day I will be working on the #8617 task. Continue with scrollbars.

[enso-bot]

Keziah Wesley reports a new STANDUP for today (2024-03-06):

Progress: Finished scrollbars. It should be finished by 2024-03-06.

Next Day: Next day I will be working on the #8617 task. Take something from backlog.