Insert message for getting data file from micro:bit

[Jaqster]

Repro -

• Use Data Logger and Serial blocks in a program
• Download program to micro:bit
• Click Show console Device
• Toggle to Data Log view

This view is currently blank. In the future we could show the MY_DATA file contents, but for now, let's include some messaging and a link to information for how people can open this file.
Proposed messaging: "To get device data from your micro:bit, you will need to access the MY_DATA.HTM file on your micro:bit device. To learn more about how to do this, see https://support.microbit.org/support/solutions/articles/19000127398-my-data-htm"

[Jaqster]

@jaustin - FYI. Also, probably need to update that support article.

[jwunderl]

Quick update here, the csv view should now only show up if you're in sim data view / not have any view at all on hw (if you see otherwise please let me know :) )

We can still add some text here pointing out "if you're on hardware go to MY_DATA.HTM" as you mentioned if needed but just need to know where to put that / a quick design to not just have floating text there. (I suppose a (?) icon in the top right corner pointing at the docs page might be just as good?)

[abchatra]

This is waiting on the codal changes. @jaustin @JohnVidler

[abchatra]

This is not relevant after we implement https://github.com/microsoft/pxt-microbit/issues/4916