core: removed deprecated IdentityApi methods

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

.changeset/fifty-horses-battle.md

@@ -0,0 +1,24 @@
+---
+'@backstage/core-plugin-api': minor
+---
+
+Removed deprecated `IdentityApi` methods: `getUserId`, `getIdToken`, and `getProfile`.
+
+Existing usage of `getUserId` can be replaced by `getBackstageIdentity`, more precisely the equivalent of the previous `userId` can be retrieved like this:
+
+```ts
+import { parseEntityRef } from '@backstage/catalog-model';
+
+const identity = await identityApi.getBackstageIdentity();
+const { name: userId } = parseEntityRef(identity.userEntityRef);
+```
+
+Note that it is recommended to consume the entire `userEntityRef` rather than parsing out just the name, in order to support namespaces.
+
+Existing usage of `getIdToken` can be replaced by `getCredentials`, like this:
+
+```ts
+const { token } = await identityApi.getCredentials();
+```
+
+And existing usage of `getProfile` is replaced by `getProfileInfo`, which returns the same profile object, but is now async.

.changeset/mean-rings-burn.md

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+---
+'@backstage/core-app-api': minor
+'@backstage/core-plugin-api': minor
+---
+
+Removed deprecated `SignInResult` type, which was replaced with the new `onSignInSuccess` callback.