feat: Disable session lock when running in element-desktop (#30643)

* feat: Disable session lock when running in element-desktop

* feat: Use Platform abstractions over direct invocation for session lock.

* fix: Remove window.electron checks from session lock methods.

* docs: Remove extraneous doc comments.

* feat: Convert BasePlatform session methods to abstract methods.

* fix: Check for PlatformPeg instance in session lock.

* fix: Remove async marker from checkSessionLockFree

test/test-utils/platform.ts

@@ -10,6 +10,7 @@ import { type MethodLikeKeys, mocked, type MockedObject } from "jest-mock";
 
 import BasePlatform from "../../src/BasePlatform";
 import PlatformPeg from "../../src/PlatformPeg";
+import * as SessionLock from "../../src/utils/SessionLock";
 
 // doesn't implement abstract
 // @ts-ignore
@@ -18,6 +19,14 @@ class MockPlatform extends BasePlatform {
         super();
         Object.assign(this, platformMocks);
     }
+
+    public checkSessionLockFree(): boolean {
+        return SessionLock.checkSessionLockFree();
+    }
+
+    public async getSessionLock(onNewInstance: () => Promise<void>): Promise<boolean> {
+        return SessionLock.getSessionLock(onNewInstance);
+    }
 }
 /**
  * Mock Platform Peg