Deprecate withApis in @backstage/frontend-plugin-api

Moved withApis to @backstage/core-compat-api and deprecated the export
in @backstage/frontend-plugin-api, pointing users to the new location.

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

.changeset/add-withApis-core-compat-api.md

@@ -0,0 +1,5 @@
+---
+'@backstage/core-compat-api': patch
+---
+
+Added `withApis`, which is a Higher-Order Component for providing APIs as props to a component via `useApiHolder`.

.changeset/deprecate-withApis-frontend-plugin-api.md

@@ -0,0 +1,5 @@
+---
+'@backstage/frontend-plugin-api': patch
+---
+
+Deprecated `withApis`, use the `withApis` export from `@backstage/core-compat-api` instead.