add deprecation warning to configmap-server and move example Dockerfiles away from using it

[grokspawn]

Since SQLite catalogs are deprecated and opm subcommands that deal with them have been issuing deprecation warnings for some time, we should have parity to let consumers know that these services will be removed in the future.

And in order for folks to have good examples of including services in the Dockerfiles, we should not reference the deprecated tools as a FROM.

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