fix(kube): add required interactivemode for exec

[haarchri]

Explanation

when using kubeconfig with exec providers and client.authentication.k8s.io/v1 we fix the following issue:
interactiveMode must be specified for chainsaw to use exec authentication plugin

If APIVersion is client.authentication.k8s.io/v1alpha1 or client.authentication.k8s.io/v1beta1, then this field is optional and defaults to "IfAvailable" when unset. Otherwise, this field is required.

Related issue

#2263

Proposed Changes

add interactiveMode IfAvailable

Checklist

• I have read the contributing guidelines.
• I have read the PR documentation guide and followed the process including adding proof manifests to this PR.
• This is a bug fix and I have added unit tests that prove my fix is effective.

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.47%. Comparing base (bc982f8) to head (02f4928).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2264   +/-   ##
=======================================
  Coverage   67.47%   67.47%           
=======================================
  Files         148      148           
  Lines        6518     6519    +1     
=======================================
+ Hits         4398     4399    +1     
  Misses       1875     1875           
  Partials      245      245           

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