fix: Prevent registering RealtimePlugin if it is already registered

The flagship app already register the RealtimePlugin so the
SearchEngine would try to register it a second time

We assume the consuming app should be responsible to do the
registration so the solution would be to remove it from the
SearchEngine initialization

But in order to ensure backward compatibility, we chose to keep the
registration here but protected behind a check so the SearchEngine
would register it only if not already registered

packages/cozy-dataproxy-lib/src/search/@types/cozy-client.d.ts

@@ -159,7 +159,8 @@ declare module 'cozy-client' {
   }
 
   export default class CozyClient {
-    plugins: unknown
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    plugins: Record<string, any>
     constructor(rawOptions?: ClientOptions)
     getStackClient(): StackClient
     getInstanceOptions(): InstanceOptions

packages/cozy-dataproxy-lib/src/search/@types/cozy-realtime.d.ts

@@ -1,3 +1,4 @@
 declare module 'cozy-realtime' {
   export const RealtimePlugin = (): null => null
+  RealtimePlugin.pluginName = 'realtime'
 }

packages/cozy-dataproxy-lib/src/search/SearchEngine.ts

@@ -127,7 +127,9 @@ export class SearchEngine {
     void this.indexDocuments()
 
     // Ensure login is done before plugin register
-    this.client.registerPlugin(RealtimePlugin, {})
+    if (!this.client.plugins[RealtimePlugin.pluginName]) {
+      this.client.registerPlugin(RealtimePlugin, {})
+    }
 
     // Realtime subscription
     this.handleUpdatedOrCreatedDoc = this.handleUpdatedOrCreatedDoc.bind(this)
@@ -139,7 +141,6 @@ export class SearchEngine {
 
   subscribeDoctype(client: CozyClient, doctype: string): void {
     /* eslint-disable @typescript-eslint/no-unsafe-assignment, @typescript-eslint/no-unsafe-member-access, @typescript-eslint/no-unsafe-call, @typescript-eslint/unbound-method */
-    // @ts-expect-error Client's plugins are not typed
     const realtime = client.plugins.realtime
     realtime.subscribe('created', doctype, this.handleUpdatedOrCreatedDoc)
     realtime.subscribe('updated', doctype, this.handleUpdatedOrCreatedDoc)