Update Social-media blocking settings tests

[MadhaviSeelam]

Update testcases for the testcase "visit brave://settings/privacy -> Site and Shields Settings -> Cookies and site data... . " as new feature/functionality implemented brave://flags/#brave-google-sign-in-permission/Griffin study enabled. (Ref.brave/brave-browser#30364)

Case 1: Sites that rely on 3p cookies for Google Login
Allow

• visited https://www.expensify.com/
• clicked Google button
• confirmed permission prompt shown for the site expensify.com
• click Allow and keep the default permission until I close this site
• confirmed permission prompt is dismissed
• go to brave://settings/content/googleSignIn page
• confirmed https://www.expensify.com:443 site URL is shown in Allowed to use third-party cookies for legacy Google Sign-In entry
• open brave://settings/cookies in a new tab
• confirmed entries are shown Sites that can always use cookies are shown (for https://accounts.google.com, it reads as embedded on [.]expensify.com`. Same for https://[.]firebaseapp.com)
• sign out and close the tab
• the entry https://www.expensify.com:443 is removed from Allowed to use third-party cookies for legacy Google Sign-In

Block

• New profile:
• visit https://www.expensify.com/ in a new tab
• click Google button
• confirmed permission prompt shown for the site https://www.expensify.com/.
• click Block
• confirmed permission prompt is dismissed
• visited brave://settings/content/googleSignIn
• confirmed https://www.expensify.com:443 entry is shown in Not allowed to use third-party cookies for legacy Google Sign-In entry
• open brave://settings/cookies in a new tab
• confirmed entries are shown Sites that can never use cookies are shown (for https://accounts.google.com, it reads as embedded on [.]expensify.com`. Same for https://[.]firebaseapp.com)
• close the https://www.expensify.com/ site tab
• re-visit https://www.expensify.com
• click Google button
• permission prompt is shown with Allow and Block as expected

Case 2: Sites that don't rely on 3p cookies for Google Login
No permission prompt shown for sites that don't rely on 3p cookies - nytimes.com

Case 3: Disable default permissions Sites can ask to use legacy Google Sign-In via third-party cookies in brave://settings/content/googleSignIn

• new profile
• launch Brave
• opened a new-tab
• visit brave://flags
• set Enable Google Sign-In Permission Prompt to enabled in brave://flags and click Relaunch
• visited brave://settings/content/googleSignIn
• disabled Sites can ask to use legacy Google Sign-In via third-party cookies
• visited https://www.expensify.com/
• clicked Google button
• confirmed error message There was an error signing you in with Google

[LaurenWags]

Added a "blocked" label to this one as we're currently sitting at 25% enabled on Release channel with this one. Not sure of the plan to increase the rollout on Release channel atm - we should discuss and determine if we want to make these changes now or wait for further rollout on Release channel.

Can refer to https://griffin.brave.com/ and look for "BraveGoogleSignInPermissionStudy" to see rollout percentages for Release. Currently Beta/Nightly rollout of this feature is 100%.