[release-1.29] Fix : Enable system tag support prefix match

[nilo19]

What type of PR is this?

/kind bug

What this PR does / why we need it:

In the logic for updating tags, if we define systemTags, any tags not included in systemTags will be deleted. However, this behavior can cause some AKS-managed tags to be mistakenly deleted. Adding all AKS-managed tags individually to systemTags would make systemTags excessively long and difficult to maintain.

This PR enhances the comparison logic between tags and systemTags by introducing prefix matching. With this change, we can add a prefix like aks-managed to systemTags, and any tags starting with aks-managed, such as aks-managed-cluster-name or aks-managed-cluster-rg, will be successfully matched and retained, preventing accidental deletion.

This approach reduces the size of systemTags while maintaining flexibility and ensuring that AKS-managed tags are preserved.

Which issue(s) this PR fixes:

Fixes #8053

Special notes for your reviewer:

Does this PR introduce a user-facing change?

- Introduced **prefix-based matching** for `systemTags` during tag reconciliation.
- Tags starting with a prefix defined in `systemTags` (e.g., `aks-managed`) will now be matched and retained.
- For example:  Adding `aks-managed` to `systemTags` ensures tags like `aks-managed-cluster-name` and `aks-managed-cluster-rg` are preserved.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

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