qa: add test to verify recovery of alternate_name from journal

qa: add test to verify recovery of alternate_name from journal

Test without the fix:

    2024-05-16T22:34:21.781 DEBUG:teuthology.orchestra.run.smithi044:> sudo adjust-ulimits ceph-coverage /home/ubuntu/cephtest/archive/coverage timeout 300 ceph --cluster ceph --admin-daemon /var/run/ceph/ceph-mds.a.asok --format=json dump tree /dir 0
    ...
    [
      {
        "accounted_rstat": {
          "rbytes": 4096,
          "rctime": "2024-05-16T22:34:15.251864+0000",
          "rfiles": 1,
          "rsnaps": 0,
          "rsubdirs": 1,
          "version": 0
        },
        "atime": "2024-05-16T22:34:14.498880+0000",
        "auth_pins": 0,
        "auth_state": {
          "replicas": {}
        },
        "authlock": {},
        "backtrace_version": 14,
        "btime": "2024-05-16T22:34:14.498880+0000",
        "change_attr": 3,
        "client_caps": [
          {
            "client_id": 5184,
            "issued": "pAsLsXsFsx",
            "last_sent": 4,
            "pending": "pAsLsXsFsx",
            "wanted": "pAsLsXsFsxcral"
          }
        ],
        "client_ranges": [],
        "ctime": "2024-05-16T22:34:15.249864+0000",
        "damage_flags": 0,
        "dir_layout": {
          "dir_hash": 2,
          "unused1": 0,
          "unused2": 0,
          "unused3": 0
        },
        "dirfrags": [
          {
            "auth_pins": 0,
            "auth_state": {
              "replicas": {}
            },
            "committed_version": "0",
            "committing_version": "0",
            "dentries": [
              {
                "alternate_name": "bUHUwH9E8uiVaf8xZ+zONcB1CToj53x5aUUnKdnNj5U37zbh28l1AaWwHhbOT3HyzqKjmSKKW1o4odQJc7nF9xrKIB8D3b4qqb2Cs6s7t2106hHhQk5/YV7DtpeNPZnorcTqxPM/hExtWHSS4P+S+Dpwj62hMyh/77sGhiW1Filvv1gQjV+sN/GozPNwHgfleadkUs1OkRkYtgWrCjbKP0MayRtiOLrVTRuYyOp/Qt3+XCIyiS87B9bUcOFjWratF+yR0kpJ0RYriix7NKVkBJ0kGWYSCY+PYjiLeMYJBMQcCxW/nwfVku+m6fgFJvb6pjEFxIk9zT5cunSImsjr",
                "auth_pins": 0,
                "auth_state": {
                  "replicas": {}
                },
                "inode": 1099511628283,
                "is_auth": true,
                "is_freezing": false,
                "is_frozen": false,
                "is_new": false,
                "is_null": false,
                "is_primary": true,
                "is_remote": false,
                "lock": {},
                "nref": 2,
                "path": "dir/bUHUwH9E8uiVaf8xZ+zONcB1CToj53x5aUUnKdnNj5U37zbh28l1AaWwHhbOT3HyzqKjmSKKW1o4odQJc7nF9xrKIB8D3b4qqb2Cs6s7t2106hHhQk5,YV7DtpeNPZnorcTqxPM,hExtWHSS4P+S+Dpwj62hMyh,77sGhiW1Filvv1gQjV+sN,GozPNwHgfleadkUuZ+PMLCaKQXhuid9WvmHanxJnaabYDLj4VEz+EX2WsG",
    ...
    # fail + journal recovery
    2024-05-16T22:35:31.077 DEBUG:teuthology.orchestra.run.smithi044:> sudo adjust-ulimits ceph-coverage /home/ubuntu/cephtest/archive/coverage timeout 300 ceph --cluster ceph --admin-daemon /var/run/ceph/ceph-mds.a.asok --format=json dump tree /dir 0
    ...
    [
      {
        "accounted_rstat": {
          "rbytes": 4096,
          "rctime": "2024-05-16T22:34:15.251864+0000",
          "rfiles": 1,
          "rsnaps": 0,
          "rsubdirs": 1,
          "version": 0
        },
        "atime": "2024-05-16T22:34:14.498880+0000",
        "auth_pins": 0,
        "auth_state": {
          "replicas": {}
        },
        "authlock": {},
        "backtrace_version": 14,
        "btime": "2024-05-16T22:34:14.498880+0000",
        "change_attr": 3,
        "client_caps": [],
        "client_ranges": [],
        "ctime": "2024-05-16T22:34:15.249864+0000",
        "damage_flags": 0,
        "dir_layout": {
          "dir_hash": 2,
          "unused1": 0,
          "unused2": 0,
          "unused3": 0
        },
        "dirfrags": [
          {
            "auth_pins": 0,
            "auth_state": {
              "replicas": {}
            },
            "committed_version": "5",
            "committing_version": "5",
            "dentries": [
              {
                "alternate_name": "",
                "auth_pins": 0,
                "auth_state": {
                  "replicas": {}
                },
                "inode": 1099511628283,
                "is_auth": true,
                "is_freezing": false,
                "is_frozen": false,
                "is_new": false,
                "is_null": false,
                "is_primary": true,
                "is_remote": false,
                "lock": {},
                "nref": 2,
                "path": "dir/bUHUwH9E8uiVaf8xZ+zONcB1CToj53x5aUUnKdnNj5U37zbh28l1AaWwHhbOT3HyzqKjmSKKW1o4odQJc7nF9xrKIB8D3b4qqb2Cs6s7t2106hHhQk5,YV7DtpeNPZnorcTqxPM,hExtWHSS4P+S+Dpwj62hMyh,77sGhiW1Filvv1gQjV+sN,GozPNwHgfleadkUuZ+PMLCaKQXhuid9WvmHanxJnaabYDLj4VEz+EX2WsG",

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>