🐛 Fix missing changeLogUrl in Renovate customManagers

[vbottu]

What this PR does / why we need it:
Adds changelogUrl configuration to the customManagers section for the openstack-ironic dependency. This ensures that Renovate PRs for ironic version updates include a changelog link comparing the old and new commit digests, making it easier to review what changed between versions.

Fixes #810

Checklist:

• Documentation has been updated, if necessary.
• Integration tests have been added, if necessary.

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[tuminoid]

This does not work. We tried similar in #802.

$ npx --yes --package renovate -- renovate-config-validator
ERROR: Found errors in configuration
       "file": "renovate.json",
       "errors": [
         {
           "topic": "Configuration Error",
           "message": "Custom Manager contains disallowed fields: changelogUrl"
         }
       ]
 WARN: Found errors in configuration
       "file": "renovate.json",
       "warnings": [
         {
           "topic": "customManagers[0].changelogUrl",
           "message": "\"changelogUrl\" can't be used in \"customManagers\". Allowed objects: packageRules."
         }
       ]

[metal3-io-bot]

PR needs rebase.

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