Add a warning cosbench will be deprecated#317

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lee-j-sanders wants to merge 2 commits intoceph:masterfrom

lee-j-sanders:wip-ljs-cosbenchwarning

Commits on Oct 9, 2024

This change adds a warning to the README.md and cosbench benchmark class that cosbench support will be deprecated in a later PR.
lee-j-sanders
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Commits on Oct 17, 2024

Add additional comment to README.md referencing the PR in the ceph release
lee-j-sanders
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