Don't materialize Integration generated sources

[squakez]

As seen in https://github.com/apache/camel-k/pull/4812, there could be situations where we want to use a generated source only for operator capabilities, without the need to have it available at runtime. We should extend this behavior, having a concept of environment source which are in memory and not stored as Configmaps, as it happens now.

[github-actions[bot]]

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