fix: Add :app: prefix to specify exact Android task to build (#16213)

<!--
Please submit this PR as a draft initially.
Do not mark it as "Ready for review" until the template has been
completely filled out, and PR status checks have passed at least once.
-->

## **Description**

<!--
Write a short description of the changes included in this pull request,
also include relevant motivation and context. Have in mind the following
questions:
1. What is the reason for the change?
2. What is the improvement/solution?
-->

Some individuals were experiencing a build failure when running the
build command for e2e local builds. This PR applies more specific task
names to what is actually run so that it avoids running other flavors
other than what is specified

## **Related issues**

Fixes:

## **Manual testing steps**

- `yarn test:e2e:android:debug:build`
- E2E local build should build successfully

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<!-- [screenshots/recordings] -->

### **After**

<!-- [screenshots/recordings] -->
<img width="782" alt="Screenshot 2025-06-09 at 3 16 19 PM"
src="https://github.com/user-attachments/assets/4bcc5348-2ba2-44fb-b99e-482302283c96"
/>

## **Pre-merge author checklist**

- [x] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [x] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [x] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

Author: Cal-L

scripts/build.sh

@@ -595,7 +595,8 @@ buildAndroidRunE2E(){
 	then
 		source $ANDROID_ENV_FILE
 	fi
-	cd android && ./gradlew assembleProdDebug assembleProdDebugAndroidTest -PminSdkVersion=26 -DtestBuildType=debug --build-cache --parallel && cd ..
+	# Specify specific task name :app:TASKNAME to prevent processing other variants
+	cd android && ./gradlew :app:assembleProdDebug :app:assembleProdDebugAndroidTest -PminSdkVersion=26 -DtestBuildType=debug --build-cache && cd ..
 }
 
 buildIos() {