fix: don't use appIdSuffix to generate run task

[cbrevik]

Summary:

Ref. discussion in #1085

Upgrade to CLI v4.4 breaks normal usage of --appIdSuffix. Bug was introduced with 19ac71f#diff-b668aefc66b33ed6e984d3467db0abc1R54 where appIdSuffix is concatenated to variant in order to generate the run task name.

The suffix should probably only be used to launch the correct package, and not for deciding what to build. If the user needs to specify some build type + flavor, the best thing is to put the full variant name in --variant.

Test Plan:

1. Create a new React Native project
2. Add an applicationIdSuffix to the debug buildType in android/app/build.gradle:

    buildTypes {
        debug {
            applicationIdSuffix ".debug"
            signingConfig signingConfigs.debug
        }
    }

3. Run npx react-native run-android --appIdSuffix debug to verify that just appIdSuffix works
4. Add a product flavor in android/app/build.gradle:

    flavorDimensions "version"
    productFlavors {
        demo {
            dimension "version"
            applicationIdSuffix ".demo"
        }
    }

5. Run npx react-native run-android --appIdSuffix demo.debug --variant demoDebug to verify that variant and appIdSuffix works.

[thymikee]

Not sure why I put appIdSuffix there, likely a leftover from previous attempt to that PR.