Refactor Bazel configuration to reduce/eliminate platform-specific flags

[cgrindel]

Is your feature request related to a problem? Please describe.

This repository defines named configurations based upon platform (e.g. linux-nixpkgs, macos-nixpkgs, linux-bindist, macos-bindist). In theory, some/all of the configuration could be migrated to platform discovery features using target_compatible_with or select().

Describe the solution you'd like

Review the OS-specific configuration settings and propose alternative implementations.

[cgrindel]

How to detect if in a Nix shell: nix-shell vs nix shell.

[cgrindel]

More on how to detect if in Nix shell

• Straightforward way to determine if inside a nix shell NixOS/nix#6677
• Related discussion on Discourse

[cgrindel]

Quick update:

• It turns out in Bazel 6.4.0, toolchain resolution occurs before incompatible targets. This causes failures when trying to specify target_compatible_with. chore: migrate to target_compatible_with #2106
• I started trying to upgrade rules_hakell to Bazel 7. chore: upgrade to bazel 7 #2107
  • There are a number of errors.
  • One of the errors that has been difficult to track down is that cc_library targets build differently under Bazel 7 vs Bazel 6.x on MacOS.