Remove the cc_common.cc_toolchain_attr and java_common.java_runtime_attr in favor of the cc_toolchain_alias() and the java_runtime_alias() rules introduced in https://github.com/bazelbuild/bazel/commit/440919933dc11d8aa4394dbd53790271a2073bc5.

These two serve the same purpose; the attributes were originally introduced in https://github.com/bazelbuild/bazel/commit/28c9617d53bf58dcba9572bcfdc165c62421d983 and https://github.com/bazelbuild/bazel/commit/4634ff903d1aaec59d545bd28a139d6cf2b95e0d respectively in order to avoid introducing the magic rule classes. However, the magic rule classes needed to be introduced anyway so that existing rules can declare which Make variables they use and there is no point in having two mechanisms to do the same thing.

RELNOTES[INC]: cc_common.cc_toolchain_attr and java_common.java_runtime_attr are not supported anymore and were replaced with the cc_toolchain_alias() and java_runtime_alias() rules.

PiperOrigin-RevId: 161799608

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