Gradle clean doesn't use the Gradle wrapper when present

## Prerequisites

* [x] I am running the latest version. (`up upgrade`)
* [x] I searched to see if the issue already exists.
* [x] I inspected the verbose debug output with the `-v, --verbose` flag.
* [ ] Are you an Up Pro subscriber?

## Description

TLDR: in the `javaGradle` support in `runtimes.go`, both the build and clean hooks should check for the availability of the gradle wrapper.

See https://github.com/apex/up/blob/c5f75ffec627c805a356b0c5cb47a0f4f3591875/config/runtimes.go#L95

The default clean hook fails for my project. In particular, my project is a Java Gradle project with the Gradle wrapper installed. I also have a local Gradle installation which is a different version than the wrapper. Due to https://github.com/johnrengelman/shadow/issues/287 , the project fails when running with the locally installed version of Gradle, but works when the wrapper is used. By default, up is currently using the wrapper for build, but the locally installed Gradle for clean.

## Steps to Reproduce

With a project that uses Gradle and has the wrapper installed, run `up deploy -v` and see that the clean didn't use the Gradle wrapper.

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