health check UI brainstorming

[devoncarew]

Here's an alternative UI for the health check. This displays the information proportional to the changes in the PR - lists the changes files and affected packages. It mixes the different checks into one format (so has the drawback that it's more work to make some of the checks optional).

cc @mosuem

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Changed Files

File	Notes	Coverage
✔️ pkgs/foo/lib/main.dart		💚 100 %
⚠️ pkgs/foo/bin/main.dart	License header missing; ...	💔 Not covered
✔️ pkgs/foo/test/main.dart		💚 40 % ⬆️ 1 %

Packages

No publishable packages affected by this PR.

-or-

Package	Changes	Changelog
⚠️ package:foo (pkgs/foo)	4 changed files	No changelog update Please provide ...
✔️ package:bar (pkgs/bar)	2 changed files	- Lorem ipsum 1 ... - Lorem ipsum 1 ...

[devoncarew]

@mosuem - any thoughts here? These ideas may be a bit out of date now, but I think it would be worth taking another pass at the current health check output given that we'll probably be enabling it on more of our repos.

[mosuem]

Yeah happy about any ideas for a nicer UX! We also probably want to link to more information about everything and add more docs while we are at it...