Merge pull request #17474 from backstage/freben/hack-presentation

An `entityPresentationApiRef`, for rendering rich entity refs

.changeset/heavy-experts-accept.md

@@ -0,0 +1,17 @@
+---
+'@backstage/plugin-catalog-react': minor
+---
+
+Added an `EntityPresentationApi` and associated `entityPresentationApiRef`. This
+API lets you control how references to entities (e.g. in links, headings,
+iconography etc) are represented in the user interface.
+
+Usage of this API is initially added to the `EntityRefLink` and `EntityRefLinks`
+components, so that they can render richer, more correct representation of
+entity refs. There's also a new `EntityDisplayName` component, which works just like
+the `EntityRefLink` but without the link.
+
+Along with that change, the `fetchEntities` and `getTitle` props of
+`EntityRefLinksProps` are deprecated and no longer used, since the same need
+instead is fulfilled (and by default always enabled) by the
+`entityPresentationApiRef`.

.changeset/smart-dancers-watch.md

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+---
+'@backstage/core-plugin-api': minor
+---
+
+`IconComponent` can now have a `fontSize` of `inherit`, which is useful for in-line icons.

.changeset/wild-cows-watch.md

@@ -0,0 +1,10 @@
+---
+'@backstage/plugin-catalog': minor
+---
+
+Added the `DefaultEntityPresentationApi`, which is an implementation of the
+`EntityPresentationApi` that `@backstage/plugin-catalog-react` exposes through
+its `entityPresentationApiRef`. This implementation is also by default made
+available automatically by the catalog plugin, unless you replace it with a
+custom one. It batch fetches and caches data from the catalog as needed for
+display, and is customizable by adopters to add their own rendering functions.