[BUGFIX beta] Make assertions from on
and fn
more actionable.
#18871
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Prior to these changes, the assertions for
fn
andon
were very inactionable. This leverages the debug render tree information to print the template contexts (route hierarchy, component invocation heirarchy, etc) along with the path name used for the callback argument.This is essentially a rewrite of the work started by @patricklx in #18353 (since that PR had to be reverted due to changes in glimmer-vm internals since it was proposed).