endpoint: Rename variable to remove collision w/ imported package

[draychev]

This is a noop change, which renames a variable from service to kubeService to avoid collision w/ an imported package.

No functional code changes.

Affected area:

• New Functionality [ ]
• Documentation [ ]
• Install [ ]
• Control Plane [ ]
• CLI Tool [ ]
• Certificate Management [ ]
• Networking [ ]
• Metrics [ ]
• SMI Policy [ ]
• Security [ ]
• Tests [ ]
• CI System [ ]
• Performance [ ]
• Other [ ]

Please answer the following questions with yes/no.

• Does this change contain code from or inspired by another project? If so, did you notify the maintainers and provide attribution?

[codecov-io]

Codecov Report

Merging #1973 into main will increase coverage by 0.01%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main    #1973      +/-   ##
==========================================
+ Coverage   57.50%   57.52%   +0.01%     
==========================================
  Files         136      136              
  Lines        5462     5462              
==========================================
+ Hits         3141     3142       +1     
+ Misses       2318     2317       -1     
  Partials        3        3              

Impacted Files	Coverage Δ
pkg/endpoint/providers/kube/client.go	83.76% <80.00%> (ø)
pkg/envoy/route/config.go	96.03% <0.00%> (+0.79%)	⬆️

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[shashankram]

Another common example of this problem is with using the variable name catalog that collides with the package name.