Fix multi-arch version parsing in ocp_version_facts role

Issue: Pull specs with `-multi` suffix (e.g., 4.21.20-multi) were not
being stripped, causing incorrect artifact URLs to be constructed.

Root Cause: The regex in pull-spec-provided.yml only stripped single-arch
suffixes (x86_64, aarch64, etc.) but not the `-multi` suffix used for
multi-arch release images.

Fix: Added `multi` to the architecture suffix regex pattern so that
`quay.io/openshift-release-dev/ocp-release:4.21.20-multi` correctly
parses to `4.21.20` instead of `4.21.20-multi`.

This fix was previously implemented in commit c311f06 but was lost
during refactoring (documented in MULTI_ARCH_SIG_MIRRORING_ISSUE.md).

Before: ocp_version_facts_parsed_release = "4.21.20-multi"
After:  ocp_version_facts_parsed_release = "4.21.20"

Fixes: Build #17 OC client download URL construction

Author: ccardenosa

playbooks/roles/ocp_version_facts/tasks/pull-spec-provided.yml

@@ -9,7 +9,7 @@
       {{
         (ocp_version_facts_pull_spec | default(''))
         | regex_replace('^.*:', '')
-        | regex_replace('-(x86|x64|x86_64|aarch64|ppc64le|s390x)$', '')
+        | regex_replace('-(x86|x64|x86_64|aarch64|ppc64le|s390x|multi)$', '')
       }}
 
 - name: Display parsed release version for debugging