fix(replays): default mask/block setting in project creation should be true (#68689)

fixes #68688

for project creation, pass in a default `replayOptions` param since one
isn't set:

<img width="1266" alt="SCR-20240411-hwpk"
src="https://github.com/getsentry/sentry/assets/56095982/e0272c8a-ad00-4a6c-84ad-c35baea3491a">

Author: michellewzhang

static/app/components/onboarding/gettingStartedDoc/onboardingLayout.tsx

@@ -84,6 +84,7 @@ export function OnboardingLayout({
       },
       platformOptions: selectedOptions,
       newOrg,
+      replayOptions: {block: true, mask: true},
     };
 
     return {