Rework script "run_coverage"

[chykon]

Description & Motivation

The old script called the "format_coverage" command, which accessed the ".packages" file, which will be completely deprecated in Dart 2.19. Dart 2.18 requires either explicitly requesting the generation of ".packages" with a temporary flag, or removing the reference to the ".packages" file from the script.

The script has been rewritten in a more strict style that stops execution when an error occurs (the old script was executed on error to the end).

The location directory has also been changed to follow the packaging convention.

Related Issue(s)

No.

Testing

Run the script, wait for execution, open index.html

Backwards-compatibility

Is this a breaking change that will not be backwards-compatible? If yes, how so?

No. I did not find any references to the old script in the code.

Documentation

Does the change require any updates to documentation? If so, where? Are they included?

No.

[mkorbel1]

Looks great, thank you for the contribution!

I tried your branch out locally and everything seems to work. I hadn't noticed the .packages change.