Import properties from build.gradle and remove hardcoded quarkus.package.output-directory

[jacobdotcosta]

• Import properties defined in the build.gradle file using the syntax described below
• Replace the hard-coded output location if a quarkus.package.output-directory value is passed through configuration

build.gradle quarkus property definition:

quarkus {
    properties {
        set("package.type", "uber-jar")
        set("package.output-directory", "build-gradle-output-dir")
    }
}

Closes quarkusio/quarkus#28897
Closes quarkusio/quarkus#28896

PR: quarkusio/quarkus#29971

[jacobdotcosta]

MR has been merged.