rgw/admin: 'data sync status' formats binary error repo entries

[cbodley]

the error repo keys were converted to a binary format for resharding support, so they could encode the optional generation number. the data sync status command now uses rgw::error_repo::decode_key() to parse these and format them correctly

Fixes: https://tracker.ceph.com/issues/59174

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[cbodley]

without the fix:

    "recovering_buckets": [
        "<80>\u0001\u0001Z\u0000\u0000\u0000\n\nG\u0000\u0000\u0000\u0006\u0000\u0000\u0000testbucket\u0000\u0000\u0000\u00000\u0000\u0000\u0000f48cfc12-b34a-4ba8-a849-10785cc33c8a.4190.1\u0000\u0000\u0000\u0000\u0000<FF><FF><FF><FF>\u0002\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000" 
    ]

and with:

    "recovering_buckets": [                                                                                                                                   
        "testbucket:f48cfc12-b34a-4ba8-a849-10785cc33c8a.4190.1:2[0]"                                                                                         
    ],

[mattbenjamin]

this is showing up in output from downstream users on rhcs-5.3, obviously; I would like to create bzs for downstream backports, would that be problematic?

[cbodley]

this is showing up in output from downstream users on rhcs-5.3, obviously; I would like to create bzs for downstream backports, would that be problematic?

please do!

[mattbenjamin]

lgtm

[cbodley]

passed qa after reruns; see #50648 (comment) for details