run_binary rule should support $(execpath ...) etc.

Right now `run_binary` only supports `$(location …)`, cf. https://github.com/bazelbuild/bazel-skylib/blob/5bfcb1a684550626ce138fe0fe8f5f702b3764c3/rules/run_binary.bzl#L37. It should also support `$(execpath …)` and possible (if it makes sense) `$(rootpath …)` and `$(rlocationpath …)`. (Same with the pluralized forms, of course.)

Read rules/run_binary.bzl around the linked line to understand the existing $(location …) handling. Check the surrounding rule tests, if present, and determine the expected behavior for execpath, rootpath, rlocationpath, and their plural forms. Done means the supported substitutions work consistently without changing existing location behavior.

Written by the indexing model from the issue text.