Resolve labels in java_toolchain_default relative to java_tools repo
Usecase for `java_toolchain_default` is:
```
load("@remote_java_tools_linux//:java_toolchain_default.bzl", "java_toolchain_default)
java_toolchain_default(
name = "mytoolchain",
javabuilder = ["//:VanillaJavaBuilder"],
)
```
In order to make the use easier, we need to resolve labels relatively to current repo. Otherwise the user would need to specify `javabuilder = ["@remote_java_tools_linux//:VanillaJavaBuilder"]`.
Closes #12408.
PiperOrigin-RevId: 340635441
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