Increase timeout to wait for cluster generations to be same

[panktishah26]

Description of changes:
For nutanix e2e tests, cluster controller takes some more time to reconcile generation and observered generation value and also takes some more time to reconcile cluster and machineconfig objects. Increased wait time to 10 minutes.

Testing (if applicable):

Documentation added/planned (if applicable):

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[panktishah26]

/cherrypick release-0.18

[eks-distro-pr-bot]

@panktishah26: once the present PR merges, I will cherry-pick it on top of release-0.18 in a new PR and assign it to you.

In response to this:

/cherrypick release-0.18

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6ba1416) 72.02% compared to head (2082f0f) 72.02%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6884   +/-   ##
=======================================
  Coverage   72.02%   72.02%           
=======================================
  Files         532      532           
  Lines       41703    41704    +1     
=======================================
+ Hits        30037    30038    +1     
  Misses       9992     9992           
  Partials     1674     1674           

Files	Coverage Δ
pkg/clustermanager/applier.go	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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[tatlat]

/lgtm

[eks-distro-bot]

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[eks-distro-pr-bot]

@panktishah26: new pull request created: #6885

In response to this:

/cherrypick release-0.18

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.