fix: RCTAppDelegate::bundleURL not implemented

[DanielSRS]

Summary:

RNM 0.76 apps created with react-native-macos-init fails to load the javascript bundle at start due to a missing implementation of RCTAppDelegate::bundleURL in the template, as described in #2305

this PR just updates the template to add the missing method

Test Plan:

Run react-native-macos-init and check that the created project builds and run

[tido64]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Saadnajmi]

Sorry for the delay,I was double checking whether we should just get rid of sourceURLForBridge altogether (I think not, an iOS project generated with @react-native-community/cli init still has it). If you want to have this change in 0.76, feel free make a PR against 0.76-stable

[Saadnajmi]

Sorry for the delay,I was double checking whether we should just get rid of sourceURLForBridge altogether (I think not, an iOS project generated with @react-native-community/cli init still has it). If you want to have this change in 0.76, feel free make a PR against 0.76-stable

Oh wait. This was on 0.76-stable. Could you also make a PR against main @DanielSRS ?

[DanielSRS]

Sorry, I just realized that I should've put 0.76 on the title to make it clear where the fix was landing 😅

I created another PR against main with these changes