Establish a way to test components inside the H&B app without publishing to npm

[timwright12]

During our first component build we had a heck of a time testing inside the app without a patch publish to npm. yarn link is supposed to work, so ideally we should be able to use that, but any way we can test inside the app is fine. This ticket is to get that working and document the process.

Starting the investigation with yarn link.

Definition of done

• Components are testable in the VA mobile app
• Documentation about how to do it is published

[timwright12]

Documented process should be:

in va-mobile-library/packages/components, run YARN_IGNORE_PATH=1 yarn link
in va-mobile-app/VAMobile run yarn link @department-of-veterans-affairs/mobile-components

However, the app is having trouble resolving the symlink imports

[timwright12]

Discovered that the issue here is that "The link command doesn't work because React Native packager doesn't support symlinks." (reference)

So we can't use yarn link.

There's another packager called Haul that supports it, but this would have to be installed in the app instead of the native packer, so I'm calling this one a non-starter.

Still investigating other ways

[timwright12]

I was able to get yarn link working with metro (and watch commands), but it doesn't work very well and it's really sluggish. Because of this we're just going to link to the package directly with:
"@department-of-veterans-affairs/mobile-component-library": "file:../../va-mobile-library/packages/components",

I'm going to move on to testing a CI check to make sure the app build works, we can use that as a baseline as well to make sure we're not breaking the app.

Slack update as well

[timwright12]

Working PR: department-of-veterans-affairs/va-mobile-library#20

[timwright12]

PR is ready to run tests against the va-mobile-app

Should be closing this up soon with a documentation PR

[timwright12]

Documentation PR: #6918