Bazaar: Link to the member user catalog entity

If the optional user entity ref is available the link for a member will
point to the backstage catalog page for the user. Otherwise it will
default to the current "https://github.com/${displayName}".

Signed-off-by: Niklas Aronsson <niklasar@axis.com>

plugins/bazaar-backend/api-report.md

@@ -5,6 +5,7 @@
 ```ts
 import { Config } from '@backstage/config';
 import express from 'express';
+import { IdentityApi } from '@backstage/plugin-auth-node';
 import { Logger } from 'winston';
 import { PluginDatabaseManager } from '@backstage/backend-common';
 
@@ -18,6 +19,8 @@ export interface RouterOptions {
   // (undocumented)
   database: PluginDatabaseManager;
   // (undocumented)
+  identity: IdentityApi;
+  // (undocumented)
   logger: Logger;
 }