fix(daemon): enable go vet check on pull requests

[lavarou]

Address issues spotted by go vet:

• fix syntax of kubernetes.KubernetesServiceHost struct tags
• ensure context.cancel() is always called to avoid context leak

Add go vet check for pull requests

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	✅	7/7 passing
SOAK	❌	61/62 passing

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.61%. Comparing base (f26aead) to head (630dcbf).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1005   +/-   ##
=======================================
  Coverage   78.61%   78.61%           
=======================================
  Files         196      196           
  Lines       27069    27069           
=======================================
  Hits        21280    21280           
  Misses       5789     5789           

Flag	Coverage Δ
agent-for-php-7.2	78.62% <ø> (ø)
agent-for-php-7.3	78.64% <ø> (ø)
agent-for-php-7.4	78.34% <ø> (ø)
agent-for-php-8.0	78.36% <ø> (ø)
agent-for-php-8.1	78.35% <ø> (ø)
agent-for-php-8.2	77.94% <ø> (ø)
agent-for-php-8.3	77.94% <ø> (ø)

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