Remove "setup_environment" and "setup_dependent_environment" (#29463)

fixes #29446

The new setup_*_environment functions have been falling back
to calling the old functions and warn the user since #11115.

This commit removes the fallback behavior and any use of:
- setup_environment
- setup_dependent_environment
in the codebase

var/spack/repos/tutorial/packages/elpa/package.py

@@ -44,7 +44,7 @@ def libs(self):
 
     build_directory = 'spack-build'
 
-    def setup_environment(self, spack_env, run_env):
+    def setup_run_environment(self, env):
         # TUTORIAL: set the following environment variables:
         #
         # CC=spec['mpi'].mpicc

var/spack/repos/tutorial/packages/mpich/package.py

@@ -75,7 +75,7 @@ class Mpich(AutotoolsPackage):
     conflicts('netmod=mxm', when='@:3.1.3')
     conflicts('netmod=tcp', when='device=ch4')
 
-    def setup_dependent_environment(self, spack_env, run_env, dependent_spec):
+    def setup_dependent_build_environment(self, env, dependent_spec):
         # TUTORIAL: set the following variables for dependents:
         #
         # MPICC=join_path(self.prefix.bin, 'mpicc')