keep event stream alive even if its taking a while

Signed-off-by: Brian Fletcher <brian@roadie.io>

.changeset/hungry-stingrays-type.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-techdocs-backend': patch
+---
+
+Keep the tech docs sync event stream alive even if it is taking a while to build.

plugins/techdocs-backend/src/service/DocsSynchronizer.ts

@@ -128,7 +128,13 @@ export class DocsSynchronizer {
         cache: this.cache,
       });
 
+      const interval = setInterval(() => {
+        taskLogger.info(
+          'The docs building process is taking a little bit longer to process this entity. Please bear with us.',
+        );
+      }, 10000);
       const updated = await this.buildLimiter(() => docsBuilder.build());
+      clearInterval(interval);
 
       if (!updated) {
         finish({ updated: false });