changesets: added changesets for identity and token manager removal

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

.changeset/brown-actors-clap.md

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+---
+'@backstage/backend-plugin-api': minor
+---
+
+**BREAKING**: The deprecated identity and token manager services have been removed. This means that `coreServices.identity` and `coreServices.tokenManager` are gone, along with related types and utilities in other packages.

.changeset/kind-moose-learn.md

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+---
+'@backstage/backend-app-api': minor
+---
+
+**BREAKING**: The deprecated `identityServiceFactory` and `tokenManagerServiceFactory` have been removed.

.changeset/large-poets-check.md

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+---
+'@backstage/plugin-catalog-backend-module-bitbucket-cloud': patch
+'@backstage/plugin-search-backend-module-techdocs': patch
+'@backstage/plugin-search-backend-module-catalog': patch
+'@backstage/plugin-search-backend-module-explore': patch
+'@backstage/plugin-permission-node': patch
+'@backstage/plugin-signals-backend': patch
+'@backstage/plugin-auth-backend': patch
+---
+
+Internal refactor to remove dependencies on the identity and token manager services, which have been removed. Public APIs no longer require the identity service or token manager to be provided.

.changeset/popular-cooks-camp.md

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+---
+'@backstage/backend-test-utils': minor
+---
+
+**BREAKING**: Removed service mocks for the identity and token manager services, which have been removed from `@backstage/backend-plugin-api`.

.changeset/swift-radios-enjoy.md

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+---
+'@backstage/backend-common': patch
+---
+
+Internal refactor to re-declare the token manager service which was removed from `@backstage/backend-plugin-api`, but is still supported in this package for backwards compatibility.

.changeset/twenty-clouds-melt.md

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+---
+'@backstage/backend-defaults': minor
+---
+
+**BREAKING**: The default backend instance no longer provides implementations for the identity and token manager services, which have been removed from `@backstage/backend-plugin-api`.
+
+If you rely on plugins that still require these services, you can add them to your own backend by re-creating the service reference and factory.
+
+The following can be used to implement the identity service:
+
+```ts
+import {
+  coreServices,
+  createServiceFactory,
+  createServiceRef,
+} from '@backstage/backend-plugin-api';
+import {
+  DefaultIdentityClient,
+  IdentityApi,
+} from '@backstage/plugin-auth-node';
+
+backend.add(
+  createServiceFactory({
+    service: createServiceRef<IdentityApi>({ id: 'core.identity' }),
+    deps: {
+      discovery: coreServices.discovery,
+    },
+    async factory({ discovery }) {
+      return DefaultIdentityClient.create({ discovery });
+    },
+  }),
+);
+```
+
+The following can be used to implement the token manager service:
+
+```ts
+import { ServerTokenManager, TokenManager } from '@backstage/backend-common';
+import { createBackend } from '@backstage/backend-defaults';
+import {
+  coreServices,
+  createServiceFactory,
+  createServiceRef,
+} from '@backstage/backend-plugin-api';
+
+backend.add(
+  createServiceFactory({
+    service: createServiceRef<TokenManager>({ id: 'core.tokenManager' }),
+    deps: {
+      config: coreServices.rootConfig,
+      logger: coreServices.rootLogger,
+    },
+    createRootContext({ config, logger }) {
+      return ServerTokenManager.fromConfig(config, {
+        logger,
+        allowDisabledTokenManager: true,
+      });
+    },
+    async factory(_deps, tokenManager) {
+      return tokenManager;
+    },
+  }),
+);
+```