Feature #6054: Add excludeLabelSelector to PrefixTransformer and SuffixTransformer

[saitejabandaru-in]

Fixes #6054.

Adds an excludeLabelSelector field to both the PrefixTransformer and SuffixTransformer built-in plugins. Resources matching the provided label selector will be entirely skipped during the prefix/suffix transformation, allowing for finer-grained control over naming updates (e.g. for global or shared resources that should retain their original names).

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