[🐘 gradle-plugin] Use Gradle normalization instead of ours

[martinbonnin]

We don't need internal sourceRoots as FileCollection rightfully includes the normalized path.

This simplifies the code quite a bunch but is unfortunately blocked on gradle/gradle#28147 (edit found a workaround)

This is a behaviour change for users using both packageNameFromFilePaths and schemaFile that can be mitigated by using schemaFiles instead:

    packageNameFromFilePaths()

    // replace
    schemaFile.set("src/main/graphql/com/example/schema.graphqls")

    // with
    schemaFiles.from(fileTree("src/main/graphql/").apply {
      include("com/example/schema.graphqls")
    })

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[martinbonnin]

I found a workaround

[BoD]

🐘