bazel_6: fix: make patched bash a native binary

https://hydra.nixos.org/build/240805256/nixlog/1
https://hydra.nixos.org/build/240805170/nixlog/2
Failure is a bit obscured but long story short, a script within
bazel gets custom nixpkgs shebang which in turn makes shell run
in POSIX-compatible mode. Bazel expects bash in non-POSIX mode
and osx-specific script starts to fail due to `set -e` and subshell
interaction differences in those modes (sub-shells and functions
suddently start inheriting `set -e` and fail to produce desired
output). More debug info is available in #267670

Shell scripts aren't guaranteed to work as interpreters in shebang.
In particular thin shell wrappers aren't shebang-ready on MacOS.
It may work sometimes depending on what exactly would try to execute
a script with such shebang, but generally it's not guaranteed to work.
See #124556

Bash wrapper was introduced in #266847 and so far seems like the
issue only affects darwin builds: hydra failure is in osx-specific
script, also shebang issue is usually darwin-specific.

Let's wrap it as a native binary to make it shebang-compatible.

The wrapper is only currently added to `bazel_6` so no need for
changes in other versions.

ZHF: #265948

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