Use RUBY_PATH and HOMEBREW_RUBY_EXEC_ARGS more universally

Library/Homebrew/dev-cmd/prof.rb

@@ -32,7 +32,7 @@ module Homebrew
     if args.stackprof?
       Homebrew.install_gem_setup_path! "stackprof"
       with_env HOMEBREW_STACKPROF: "1" do
-        system ENV["HOMEBREW_RUBY_PATH"], brew_rb, *args.named
+        system RUBY_PATH, brew_rb, *args.named
       end
       output_filename = "prof/d3-flamegraph.html"
       safe_system "stackprof --d3-flamegraph prof/stackprof.dump > #{output_filename}"

Library/Homebrew/dev-cmd/ruby.rb

@@ -33,10 +33,9 @@ module Homebrew
     ruby_sys_args << "-e #{args.e}" if args.e
     ruby_sys_args += args.named
 
-    exec RUBY_PATH,
-         ENV["HOMEBREW_RUBY_WARNINGS"],
+    exec(*HOMEBREW_RUBY_EXEC_ARGS,
          "-I", $LOAD_PATH.join(File::PATH_SEPARATOR),
          "-rglobal", "-rdev-cmd/irb",
-         *ruby_sys_args
+         *ruby_sys_args)
   end
 end

Library/Homebrew/formula_installer.rb

@@ -1084,12 +1084,12 @@ class FormulaInstaller
 
   sig { void }
   def post_install
-    args = %W[
-      nice #{RUBY_PATH}
-      #{ENV["HOMEBREW_RUBY_WARNINGS"]}
-      -I #{$LOAD_PATH.join(File::PATH_SEPARATOR)}
-      --
-      #{HOMEBREW_LIBRARY_PATH}/postinstall.rb
+    args = [
+      "nice",
+      *HOMEBREW_RUBY_EXEC_ARGS,
+      "-I", $LOAD_PATH.join(File::PATH_SEPARATOR),
+      "--",
+      HOMEBREW_LIBRARY_PATH/"postinstall.rb"
     ]
 
     # Use the formula from the keg if:

Library/Homebrew/startup/bootsnap.rb

@@ -5,7 +5,7 @@ homebrew_bootsnap_enabled = !ENV["HOMEBREW_NO_BOOTSNAP"] && ENV["HOMEBREW_BOOTSN
 
 # portable ruby doesn't play nice with bootsnap
 # Can't use .exclude? here because we haven't required active_support yet.
-homebrew_bootsnap_enabled &&= !ENV["HOMEBREW_RUBY_PATH"].to_s.include?("/vendor/portable-ruby/") # rubocop:disable Rails/NegateInclude
+homebrew_bootsnap_enabled &&= !RUBY_PATH.to_s.include?("/vendor/portable-ruby/") # rubocop:disable Rails/NegateInclude
 
 homebrew_bootsnap_enabled &&= if ENV["HOMEBREW_MACOS_VERSION"]
   # Apple Silicon doesn't play nice with bootsnap