add the breaking API change health check

[jakemac53]

Checking to see if this still is broken for workspace repos

[github-actions[bot]]

PR Health

Breaking changes :heavy_check_mark:

Package	Change	Current Version	New Version	Needed Version	Looking good?
build_web_compilers	Breaking	4.1.0-beta.1	4.2.0	4.2.0	:heavy_check_mark:

Changelog Entry :heavy_check_mark:

Package	Changed Files

Changes to files need to be accounted for in their respective changelogs.

Package publish validation :exclamation:

Package	Version	Status
package:build	2.4.2-wip	WIP (no publish necessary)
package:build_config	1.1.2-wip	WIP (no publish necessary)
package:build_daemon	4.0.3-wip	WIP (no publish necessary)
package:build_modules	5.0.10-wip	WIP (no publish necessary)
package:build_resolvers	2.4.3-wip	WIP (no publish necessary)
package:build_runner	2.4.13	already published at pub.dev
package:build_runner_core	7.3.3-wip	WIP (no publish necessary)
package:build_test	2.2.3-wip	WIP (no publish necessary)
package:scratch_space	1.0.3-wip	WIP (no publish necessary)
package:build_web_compilers	4.2.0	(error) pub publish dry-run failed; add the publish-ignore-warnings label to ignore

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

This check can be disabled by tagging the PR with skip-version-check.

[davidmorgan]

Very old draft, please re-open if you want to do something with it :)