Forces local GitHub on web and fixes timing issue getting session

Closes #3938

src/plus/integrations/authentication/integrationAuthentication.ts

@@ -8,6 +8,7 @@ import type { Sources } from '../../../constants.telemetry';
 import type { Container } from '../../../container';
 import { gate } from '../../../system/decorators/-webview/gate';
 import { debug, log } from '../../../system/decorators/log';
+import { serialize } from '../../../system/decorators/serialize';
 import type { DeferredEventExecutor } from '../../../system/event';
 import {
 	isCloudSelfHostedIntegrationId,
@@ -479,6 +480,7 @@ class BuiltInAuthenticationProvider extends LocalIntegrationAuthenticationProvid
 	}
 
 	@debug()
+	@serialize()
 	override async getSession(
 		descriptor?: IntegrationAuthenticationSessionDescriptor,
 		options?: { createIfNeeded?: boolean; forceNewSession?: boolean },

src/plus/integrations/authentication/models.ts

@@ -1,4 +1,5 @@
 import type { AuthenticationSession } from 'vscode';
+import { isWeb } from '@env/platform';
 import type { IntegrationId, SupportedCloudIntegrationIds } from '../../../constants.integrations';
 import {
 	HostingIntegrationId,
@@ -55,9 +56,15 @@ export type CloudIntegrationAuthType = 'oauth' | 'pat';
 export const CloudIntegrationAuthenticationUriPathPrefix = 'did-authenticate-cloud-integration';
 
 export function getSupportedCloudIntegrationIds(): SupportedCloudIntegrationIds[] {
-	return configuration.get('cloudIntegrations.enabled', undefined, true)
+	let supportedCloudIntegrationIds = configuration.get('cloudIntegrations.enabled', undefined, true)
 		? supportedOrderedCloudIntegrationIds
 		: supportedOrderedCloudIssueIntegrationIds;
+	if (isWeb) {
+		// We always have a local GitHub session on vscode.dev and github.dev
+		supportedCloudIntegrationIds = supportedCloudIntegrationIds.filter(id => id !== HostingIntegrationId.GitHub);
+	}
+
+	return supportedCloudIntegrationIds;
 }
 
 export function isSupportedCloudIntegrationId(id: string): id is SupportedCloudIntegrationIds {