flutter/flutter@9b84701...814e49b

2024-08-12 [email protected] Upgrade module template AGP version (flutter/flutter#151675)
2024-08-12 [email protected] Roll Flutter Engine from 5fea110c3b20 to bcf2dcc09a13 (2 revisions) (flutter/flutter#153295)
2024-08-12 [email protected] Roll Packages from f7b1256 to d9a6de8 (9 revisions) (flutter/flutter#153291)

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Follow up to flutter#151433.

Follow up to flutter#151433.

#151675 bumped module templates to AGP 8.1.

In doing so, I tried to work around a behavior change [that was new in AGP 8.0](https://developer.android.com/build/releases/past-releases/agp-8-0-0-release-notes):
> AGP 8.0 creates no SoftwareComponent by default. Instead AGP creates SoftwareComponents only for variants that are configured to be published using the publishing DSL.

by using AGP's publishing DSL to define which variants to publish in the module's ephemeral gradle files:
```
android.buildTypes.all {buildType ->
    if (!android.productFlavors.isEmpty()) {
        android.productFlavors.all{productFlavor ->
            android.publishing.singleVariant(productFlavor.name + buildType.name.capitalize()) {
                withSourcesJar()
                withJavadocJar()
            }
        }
    } else {
        android.publishing.singleVariant(buildType.name) {
            withSourcesJar()
            withJavadocJar()
        }
    }
}
```

The problem is that this doesn't get applied to the plugin projects used by the module, so if a module uses any plugin it breaks. This PR fixes that by applying similar logic, but to each project (not just the module's project).

Tested manually with https://github.com/gmackall/GrayAddToApp, and also re-enabled an old test that tested this use case as a part of the PR.

Fixes: #154371

Follow up to flutter#151433.