internal/rosa: annotate blocked updates

These situations, while unfortunate, are inevitable at a larger scale. This change enables annotation and optional hiding of blocked updates.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/state.go

@@ -96,6 +96,8 @@ type Metadata struct {
 	//
 	// [Anitya]: https://release-monitoring.org/
 	ID int `json:"-"`
+	// Maintainer-facing reason of blocked update.
+	Blocked string `json:"block,omitempty"`
 
 	// Whether to exclude from exported functions.
 	Exclude bool `json:"exclude,omitempty"`
@@ -944,6 +946,7 @@ func (ctx *evalContext) pf(
 		k("version"):     &meta.Version,
 		k("exclude"):     &meta.Exclude,
 		k("anitya"):      &anitya,
+		k("block"):       &meta.Blocked,
 		k("latest"):      &meta.latest,
 
 		k("writable"):    &attr.Writable,