feat(replacements): add IgnoreMissingField option

[bt-macole]

This change adds a field option to replacements for IgnoreMissingField that will find/replace all matching fields and ignore resources that match the target but do not have the field instead of throwing an error.

Context:

When using replacements as a reusable component across multiple manifests, especially in environmental overlays, a common pattern emerges. For example, certain elements like an accountId in an IRSA role annotation on a ServiceAccount often need to be replaced.

In cases where you have many ServiceAccount resources—such as N applications with M workloads and M ServiceAccounts—only X of those ServiceAccounts may require the annotation replacement, while others do not.

This approach ensures flexibility, allowing replacements to be applied only where needed, without enforcing unnecessary changes across all resources.

resolves #5777

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: bt-macole / name: Mason Cole (6ed2bbf)

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This pull-request has been approved by: bt-macole
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[bt-macole]

@varshaprasad96 hihi, reaching out based on the recommendation in the above comment. any chance I could get a review on this? all feedback is greatly appreciated--thanks 🙏😊