Gradle addExtension will add BOM dependency even if platform is already in dependencies list

[mgorniew]

Describe the bug
Gradle plugin from master branch will add platform BOM dependency even if enforcedPlatform is already in dependency list.

Expected behavior
Platform BOM should not be added by addExtension task, if BOM is already present.

Actual behavior
From build.gradle, after calling .\gradlew.bat addExtension --extensions="quarkus-jackson"

dependencies {
    implementation 'io.quarkus:quarkus-jackson'
    implementation 'io.quarkus:quarkus-bom:999-SNAPSHOT'
    implementation enforcedPlatform("${quarkusPlatformGroupId}:${quarkusPlatformArtifactId}:${quarkusPlatformVersion}")
    implementation 'io.quarkus:quarkus-resteasy-jsonb'
    implementation 'io.quarkus:quarkus-resteasy'
    testImplementation 'io.quarkus:quarkus-junit5'
    testImplementation 'io.rest-assured:rest-assured'
}

To Reproduce
Steps to reproduce the behavior:

1. Create quarkus gradle project and call .\gradlew.bat addExtension --extensions="quarkus-jackson"

[quarkusbot]

/cc @quarkusio/devtools, @glefloch

[gastaldi]

Ah that's a bug in the ExtensionManager, I'll have a look