testing: module_srcs_test entry points still name repos.bzl after the extensions split #10198

Where

tools/testing/module_srcs_test.rs:8 and :21 list erlang/toolchain/repos.bzl as the nested-consumer entry point. After #10016, the erlang module extensions live in erlang/toolchain/extensions.bzl, and the d, fortran, lua, php, cuda, msvc, deploy and dart/dotnet extensions moved the same way.

Fix

• Point the entry list at each extensions.bzl that consumers load from MODULE.bazel, keep repos.bzl only where it is still loaded.
• Update the parser test text at line 107 to match.
• Run bazel test //tools/testing:all scoped to the module_srcs test.

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