feat(gatsby-plugin-preload-fonts): Add option to run in CI

[masives]

Description

Added non-interactive option of using plugin using isCI utility.

Documentation

I've added small section with information about this feature.

Related Issues

Addresses #20185

[masives]

I'm had a problem with writing up the docs, because I feel like there's no need to inform about the way it's checked but just inform that the option is there. Also I wonder if in this case it would be useful to note that the font-preload-cache.json should be added to .gitignore file. @superhawk610

[laurieontech]

Thanks for adding docs info! Left a comment below.

[laurieontech]

Learning approved!

[superhawk610]

Nice work!

[superhawk610]

@masives PR looks great, just need to get the automated tests to pass (may be worth rebasing on latest master since it seems that failures are coming from other packages).

[masives]

@superhawk610 Seems like after merging still some packages fail. Also when I run locally
yarn jest packages/gatsby-plugin-preload-fonts --watch I receive errors on missing packages. Can you suggest how should I run these?

[pvdz]

I think a comment would be good here. Perhaps a reporter action as well.

[masives]

@pvdz I believe this was solved now

[wardpeet]

Thanks, @masives! This looks awesome 👏!

fixed

[pvdz]

💜

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