fix(e2e): parse E2E_WORKERS as number for playwright config (#8133)

Author: jacekradko

integration/playwright.config.ts

@@ -14,7 +14,7 @@ export const common: PlaywrightTestConfig = {
   forbidOnly: !!process.env.CI,
   retries: process.env.CI ? 5 : 0,
   maxFailures: process.env.CI ? 5 : undefined,
-  workers: process.env.E2E_WORKERS || (process.env.CI ? '50%' : '70%'),
+  workers: process.env.E2E_WORKERS ? Number(process.env.E2E_WORKERS) : process.env.CI ? '50%' : '70%',
   use: {
     actionTimeout: 10_000,
     navigationTimeout: 30_000,