CASSANDRA-18743 Mark metrics-reporter-config as deprecated

[Mmuzaf]

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The Cassandra Jira

[Mmuzaf]

There is no need to deprecate the library usage in 5.0 release. We've agreed to remote it in 5.0 as well:

https://lists.apache.org/thread/pdq1y2xks629lh6h7nfc6mt5gp145bs6

[sarma1807]

original : > There is no need to deprecate the library usage in 5.0 release. We've agreed to remote it in 5.0 as well:

I guess it should read : > There is no need to deprecate the library usage in 5.0 release. We've agreed to remove it in 5.0 as well:

[ekaterinadimitrova2]

Correct, @sarma1807