Fix constant Gitpod Plugin exception on Gateway startup (#20291)

Author: mustard-mh

components/ide/jetbrains/gateway-plugin/src/main/kotlin/io/gitpod/jetbrains/auth/GitpodAuthCallbackHandler.kt

@@ -16,7 +16,7 @@ import org.jetbrains.io.response
 import java.nio.charset.StandardCharsets
 
 internal class GitpodAuthCallbackHandler : RestService() {
-    private val service = GitpodAuthService.instance
+    private val service = GitpodAuthService.instance.get()
 
     override fun getServiceName(): String = service.name
 

components/ide/jetbrains/gateway-plugin/src/main/kotlin/io/gitpod/jetbrains/auth/GitpodAuthService.kt

@@ -17,8 +17,10 @@ import com.intellij.credentialStore.CredentialAttributes
 import com.intellij.credentialStore.generateServiceName
 import com.intellij.ide.passwordSafe.PasswordSafe
 import com.intellij.openapi.Disposable
+import com.intellij.openapi.application.CachedSingletonsRegistry
 import com.intellij.openapi.components.Service
 import com.intellij.openapi.components.service
+import com.intellij.openapi.diagnostic.thisLogger
 import com.intellij.util.EventDispatcher
 import com.intellij.util.Url
 import com.intellij.util.Urls.encodeParameters
@@ -35,6 +37,7 @@ import java.net.http.HttpResponse
 import java.security.SecureRandom
 import java.util.*
 import java.util.concurrent.CompletableFuture
+import java.util.function.Supplier
 import kotlin.math.absoluteValue
 
 @Service
@@ -148,7 +151,8 @@ internal class GitpodAuthService : OAuthServiceBase<Credentials>() {
     }
 
     companion object {
-        val instance: GitpodAuthService = service()
+        @Suppress("UnstableApiUsage")
+        val instance: Supplier<GitpodAuthService> = CachedSingletonsRegistry.lazy { service() }
 
         private const val SERVICE_NAME = "gitpod/oauth"
         private const val CLIENT_ID = "jetbrains-gateway-gitpod-plugin"
@@ -176,7 +180,7 @@ internal class GitpodAuthService : OAuthServiceBase<Credentials>() {
         }
 
         suspend fun authorize(gitpodHost: String): String {
-            val accessToken = instance.authorize(gitpodHost).await().accessToken
+            val accessToken = instance.get().authorize(gitpodHost).await().accessToken
             setAccessToken(gitpodHost, accessToken)
             return accessToken
         }