Removed variant of cifmw-molecule-tofu job

Multiple job definitions with the same name are called variants. These
may have different selection criteria which indicate to Zuul that, for
instance, the job should behave differently on a different git branch.
In this case, we have the same jobs, doing almost the same thing.

Removed duplicated job definition.

Author: dasm

ci/config/molecule.yaml

@@ -98,3 +98,8 @@
 - job:
     name: cifmw-molecule-shiftstack
     nodeset: centos-9-crc-2-48-0-xl-ibm
+- job:
+    name: cifmw-molecule-tofu
+    nodeset: centos-9-crc-2-48-0-xl
+    files:
+      - ^ci_framework/playbooks/run_tofu.yml

ci/templates/molecule.yaml.j2

@@ -1,3 +1,5 @@
+# Don't modify this file.
+# If you need apply custom molecule changes, please edit ci/config/molecule.yaml
 {% set want_list = ['defaults', 'files', 'handlers', 'library',
                     'lookup_plugins', 'module_utils', 'molecule',
                     'tasks', 'templates', 'vars'] -%}

zuul.d/molecule.yaml

@@ -789,7 +789,9 @@
     - ^roles/tofu/(defaults|files|handlers|library|lookup_plugins|module_utils|molecule|tasks|templates|vars).*
     - ^ci/playbooks/molecule.*
     - ^.config/molecule/.*
+    - ^ci_framework/playbooks/run_tofu.yml
     name: cifmw-molecule-tofu
+    nodeset: centos-9-crc-2-48-0-xl
     parent: cifmw-molecule-base
     vars:
       TEST_RUN: tofu