Add upgrade job to run flux migrate for stale SSA managedFields across Flux CRs

What does this MR do and why?

Some Flux custom resources retain stale managedFields entries from older API versions (e.g. v2beta2). In certain cases, the same field manager is recorded with multiple API versions (e.g. v2beta2 and v2).

This leads to issues with Server-Side Apply (SSA), where the kustomize-controller fails during reconciliation when new fields are not present in the older schema.

MR !7680 (merged) fixed the issue for resources managed by kustomize-controller itself but does not solve for Flux resources managed by other controllers.

This MR adds an upgrade job that runs flux migrate  unconditionally to normalize affected resources

This prevents kustomize-controller reconciliation failures caused by deprecated schema references.

Related reference(s)

Relates to #3807 (closed) and closes #4329 (closed)

Test coverage

CI configuration

Below you can choose test deployment variants to run in this MR's CI.

Click to open to CI configuration

Legend:

Icon	Meaning	Available values
☁️	Infra Provider	capd, capo, capm3
🚀	Bootstrap Provider	kubeadm (alias kadm), rke2, okd, ck8s
🐧	Node OS	ubuntu, suse, na, leapmicro
🛠️	Deployment Options	Deployment option list and description
🎬	Pipeline Scenarios	Available scenario list and description
🟢	Enabled units	Any available units name, by default apply to management and workload cluster. Can be prefixed by mgmt: or wkld: to be applied only to a specific cluster type
🔴	Disabled units	Any available units name, by default apply to management and workload cluster. Can be prefixed by mgmt: or wkld: to be applied only to a specific cluster type
🏗️	Target platform	Can be used to select specific deployment environment Available platform list and description

• 🎬 preview ☁️ capd 🚀 kadm 🐧 ubuntu
• 🎬 preview ☁️ capo 🚀 rke2 🐧 suse
• 🎬 preview ☁️ capm3 🚀 rke2 🐧 ubuntu
• ☁️ capd 🚀 kadm 🛠️ light-deploy 🐧 ubuntu
• ☁️ capd 🚀 rke2 🛠️ light-deploy 🐧 suse
• ☁️ capo 🚀 rke2 🐧 suse
• ☁️ capo 🚀 rke2 🐧 leapmicro
• ☁️ capo 🚀 kadm 🐧 ubuntu
• ☁️ capo 🚀 kadm 🐧 ubuntu 🟢 neuvector,mgmt:harbor
• ☁️ capo 🚀 rke2 🎬 rolling-update 🛠️ ha 🐧 ubuntu
• ☁️ capo 🚀 kadm 🎬 wkld-k8s-upgrade 🐧 ubuntu
• ☁️ capo 🚀 rke2 🎬 rolling-update-no-wkld 🛠️ ha 🐧 suse
• ☁️ capo 🚀 rke2 🎬 sylva-upgrade 🛠️ ha 🐧 ubuntu
• ☁️ capo 🚀 rke2 🎬 upgrade-from-release-1.6 🛠️ ha 🐧 ubuntu
• ☁️ capo 🚀 rke2 🛠️ ha,misc 🐧 ubuntu
• ☁️ capo 🚀 rke2 🛠️ misc 🐧 ubuntu 🟢 mgmt:harbor 🔴 neuvector
• ☁️ capo 🚀 rke2 🛠️ ha,misc,openbao:penguin: suse
• ☁️ capo 🚀 rke2 🐧 suse 🎬 upgrade-from-prev-tag
• ☁️ capm3 🚀 rke2 🐧 suse
• ☁️ capm3 🚀 kadm 🐧 ubuntu
• ☁️ capm3 🚀 ck8s 🐧 ubuntu
• ☁️ capm3 🚀 kadm 🎬 rolling-update-no-wkld 🛠️ ha,misc 🐧 ubuntu
• ☁️ capm3 🚀 rke2 🎬 wkld-k8s-upgrade 🛠️ ha 🐧 suse
• ☁️ capm3 🚀 kadm 🎬 rolling-update 🛠️ ha 🐧 ubuntu
• ☁️ capm3 🚀 rke2 🎬 upgrade-from-prev-release-branch 🛠️ ha 🐧 suse
• ☁️ capm3 🚀 rke2 🛠️ misc,ha 🐧 suse
• ☁️ capm3 🚀 rke2 🎬 sylva-upgrade 🛠️ ha,misc 🐧 suse
• ☁️ capm3 🚀 kadm 🎬 rolling-update 🛠️ ha 🐧 suse
• ☁️ capm3 🚀 ck8s 🎬 rolling-update 🛠️ ha 🐧 ubuntu
• ☁️ capm3 🚀 rke2|okd 🎬 no-update 🐧 ubuntu|na
• ☁️ capm3 🚀 rke2 🐧 suse 🎬 upgrade-from-release-1.5
• ☁️ capm3 🚀 rke2 🐧 suse 🎬 upgrade-to-main

Global config for deployment pipelines

• autorun pipelines

• allow failure on pipelines

• record sylvactl events

Notes:

• Enabling autorun will make deployment pipelines to be run automatically without human interaction
• Disabling allow failure will make deployment pipelines mandatory for pipeline success.
• if both autorun and allow failure are disabled, deployment pipelines will need manual triggering but will be blocking the pipeline

Be aware: after configuration change, pipeline is not triggered automatically. Please run it manually (by clicking the run pipeline button in Pipelines tab) or push new code.