Update kubernetes client creation for single namespace:

[jacobweinstock]

Description

Single namespace look ups weren't functioning properly. They function properly now.

Why is this needed

Fixes: #

How Has This Been Tested?

How are existing users impacted? What migration steps/scripts do we need?

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• added unit or e2e tests
• provided instructions on how to upgrade

[codecov]

Codecov Report

Attention: Patch coverage is 5.00000% with 19 lines in your changes missing coverage. Please review.

Project coverage is 52%. Comparing base (2a58e52) to head (6f17387).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/smee/backend.go	0%	19 Missing ⚠️

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #536   +/-   ##
===================================
  Coverage    52%    52%           
===================================
  Files        26     26           
  Lines      2157   2152    -5     
===================================
+ Hits       1124   1127    +3     
+ Misses      991    987    -4     
+ Partials     42     38    -4     

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