core-plugin-api: deprecate OldIconComponent

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/late-stingrays-invite.md

@@ -0,0 +1,5 @@
+---
+'@backstage/core-plugin-api': patch
+---
+
+Deprecated `OldIconComponent`. Existing usage should be replaced with `IconComponent`.

packages/core-plugin-api/api-report.md

@@ -623,7 +623,7 @@ export const oktaAuthApiRef: ApiRef<
     SessionApi
 >;
 
-// @public
+// @public @deprecated
 export type OldIconComponent = ComponentType<SvgIconProps>;
 
 // @alpha

packages/core-plugin-api/src/icons/types.ts

@@ -43,5 +43,6 @@ export type IconComponent = ComponentType<{
  * migration, but it is not exported.
  *
  * @public
+ * @deprecated This type will be removed, use {@link IconComponent} instead.
  */
 export type OldIconComponent = ComponentType<SvgIconProps>;