feat: track and render build/pipeline warnings

[plyr4]

Description

track "warnings" or "additional information" and attach them to builds, steps, pipelines, etc throughout a build's lifecycle. the idea came from v0.25 breaking changes to the yaml compiler. it would be ideal if the user could get a heads up that the behavior of their pipeline may have changed in a recent release. a user will never know unless you track it and put it right in front of their face ⚠️

the idea is track things that are relevant/helpful, then render these warnings to the user in the form of UI enhancements, CLI output, etc.

other example warnings might be:

• using unsupported yaml keys (ports)
• using deprecated yaml syntax
• using features that are subject to change
• referencing secrets that arent pulled in
• referencing a secret inside the environment block
• referencing an org/repo secret in the wrong org/repo

here's a screenshot of what i'm thinking a "Pipeline Warnings" view might look like. the warning is just an example based on anchor merge changes from v0.25