[FEATURE] Update BuildRun reference documentation with new status reasons

[adambkaplan]

Is there an existing feature request for this?

• I have searched the existing feature requests

Is your feature request related to a problem or use-case? Please describe.

Follow up from shipwright-io/build#1588.

Describe the solution that you would like.

The reference documentation for BuildRun needs to add any new status reasons we are reporting, so developers can understand what they mean.

Describe alternatives you have considered.

No response

Anything else?

No response

[adambkaplan]

Marking as "Done" - was completed as part of the builds repo doc sync: #140