fix(k8s): fix waitK8SClusterDeleted function

[Mia-Cross]

The waitK8SClusterDeleted function often causes the nightly tests to fail because of an unexpected pool_required status for the cluster at the end of the WaitForCluster call.
Since we can now pass a status argument to the WaitForCluster function, we should use this instead of checking the status ourselves.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (f346ab0) 73.57% compared to head (860731d) 73.58%.
Report is 2 commits behind head on master.

❗ Current head 860731d differs from pull request most recent head 0f5dcc5. Consider uploading reports for the commit 0f5dcc5 to get more accurate results

Files	Patch %	Lines
scaleway/helpers_k8s.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2323   +/-   ##
=======================================
  Coverage   73.57%   73.58%           
=======================================
  Files         224      224           
  Lines       34742    34738    -4     
=======================================
- Hits        25563    25561    -2     
+ Misses       6975     6972    -3     
- Partials     2204     2205    +1     

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