refactor: holdUpMarker as basic trial to line up photodiode spot and …

[YUUU23]

• Move holdUpMarker code in to change original to a basic trial
• Move countdownTrial to before preloadTrial in the timeline so the countdown will begin after serialport pop-up box (all set-up completed)

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Visit the preview URL for this PR (updated for commit 1a5c733):

https://ccv-honeycomb--pr509-ref-holdupmarker-zvs9ts5j.web.app

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[RobertGemmaJr]

I'm now realizing it's probably best to handle this as version 3.4.2 of the project. With the current setup the serial port is not actually connected until the following trial.

I think it would be best to handle some sort of call-function trial that calls the Electron setupPort function before continuing. This will take a little while, and tbh I think having a really solid setup for the serial port connection is worthy of it's own patch version - it's something that's always kind of been an issue with Honeycomb.

[RobertGemmaJr]

Let's make the minor change I mentioned and then we'll create a 3.4.2 holding branch. From there we'll add the new trial as its own PR!