Add clustersyncfailing metric to crd

[suhanime]

While adding ClusterSyncFailingSeconds metric, adding it to the enum in
durationMetrics was missed, which didn't catch the appropriate make
targets for adding it to the crd. This commit fixes that.

xref: https://issues.redhat.com/browse/HIVE-1857

/assign @2uasimojo

[2uasimojo]

Yah. Sorry I missed this during review.

/lgtm

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This pull-request has been approved by: 2uasimojo, suhanime

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[codecov]

Codecov Report

Merging #1814 (2484323) into master (98148ea) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1814      +/-   ##
==========================================
- Coverage   41.74%   41.69%   -0.05%     
==========================================
  Files         353      353              
  Lines       33079    33118      +39     
==========================================
  Hits        13810    13810              
- Misses      18113    18151      +38     
- Partials     1156     1157       +1     

Impacted Files	Coverage Δ
pkg/controller/machinepool/alibabacloudactuator.go	48.61% <0.00%> (-13.21%)	⬇️
...g/controller/hibernation/hibernation_controller.go	64.97% <0.00%> (-0.37%)	⬇️
pkg/ibmclient/client.go	4.48% <0.00%> (-0.30%)	⬇️
...ller/clusterrelocate/clusterrelocate_controller.go	56.09% <0.00%> (-0.09%)	⬇️
pkg/client/clientset/versioned/clientset.go	0.00% <0.00%> (ø)