CI: Remove metalsmith legacy jobs

As reached during the PTG discussions, we are removing the metalsmith
legacy bios CI jobs.

Also disalbing ansible linters, they require ansible-lint update to
work on ubuntu noble, it'll be done in a new patch.

Depends-On: https://review.opendev.org/c/openstack/ironic-python-agent/+/933153
Depends-On: https://review.opendev.org/c/openstack/ironic/+/933151
Change-Id: I87012e725d764999bf56a5b0a54f92a161d9e6bd

.zuul.yaml

@@ -144,14 +144,6 @@
       metalsmith_swap_size: 1024
       metalsmith_traits: [CUSTOM_GOLD]
 
-- job:
-    name: metalsmith-integration-glance-centos9-legacy
-    parent: metalsmith-integration-glance-centos9-uefi
-    vars:
-      devstack_localrc:
-        IRONIC_BOOT_MODE: bios
-      metalsmith_boot_mode: bios
-
 - job:
     name: metalsmith-integration-http-cirros
     description: |
@@ -179,17 +171,14 @@
     check:
       jobs:
         - metalsmith-integration-glance-centos9-uefi
-        # NOTE(rpittau): this is broken because of an issue with tinycore
-        # moving to non-voting while we evaluate if it's worth trying to
-        # fix it or just removing it
-        - metalsmith-integration-glance-centos9-legacy:
-            voting: false
         - metalsmith-integration-http-cirros
-        - openstack-tox-linters
+        #NOTE(rpittau): disabling ansible linters for the time being
+        # we need to update ansible-lint to make it work on ubuntu noble
+        #- openstack-tox-linters
         - metalsmith-tox-codespell:
             voting: false
     gate:
       jobs:
         - metalsmith-integration-glance-centos9-uefi
         - metalsmith-integration-http-cirros
-        - openstack-tox-linters
+        #- openstack-tox-linters