techdocs: switch to using constants from techdocs-common for annotations

Signed-off-by: MT Lewis <mtlewis@users.noreply.github.com>

plugins/techdocs-backend/package.json

@@ -68,6 +68,7 @@
     "@backstage/plugin-catalog-common": "workspace:^",
     "@backstage/plugin-permission-common": "workspace:^",
     "@backstage/plugin-search-backend-module-techdocs": "workspace:^",
+    "@backstage/plugin-techdocs-common": "workspace:^",
     "@backstage/plugin-techdocs-node": "workspace:^",
     "@types/express": "^4.17.6",
     "express": "^4.17.1",

plugins/techdocs-backend/src/search/DefaultTechDocsCollator.test.ts

@@ -28,6 +28,7 @@ import {
 import { setupServer } from 'msw/node';
 import { rest } from 'msw';
 import { ConfigReader } from '@backstage/config';
+import { TECHDOCS_ANNOTATION } from '@backstage/plugin-techdocs-common';
 
 const logger = loggerToWinstonLogger(mockServices.logger.mock());
 
@@ -66,7 +67,7 @@ const expectedEntities: Entity[] = [
       name: 'test-entity-with-docs',
       description: 'Documented description',
       annotations: {
-        'backstage.io/techdocs-ref': './',
+        [TECHDOCS_ANNOTATION]: './',
       },
     },
     spec: {

plugins/techdocs-backend/src/search/DefaultTechDocsCollator.ts

@@ -37,6 +37,7 @@ import {
   CATALOG_FILTER_EXISTS,
 } from '@backstage/catalog-client';
 import { TechDocsDocument } from '@backstage/plugin-techdocs-node';
+import { TECHDOCS_ANNOTATION } from '@backstage/plugin-techdocs-common';
 
 interface MkSearchIndexDoc {
   title: string;
@@ -107,7 +108,7 @@ export class DefaultTechDocsCollator {
     ).getEntities(
       {
         filter: {
-          'metadata.annotations.backstage.io/techdocs-ref':
+          [`metadata.annotations.${TECHDOCS_ANNOTATION}`]:
             CATALOG_FILTER_EXISTS,
         },
         fields: [