chore(gcp-resource-detector): unit test to prevent a regression and ensure previously set attributes are not overwritten with blank values.

[ajbenjam]

Which problem is this PR solving?

• This PR adds a unit test to prevent a regression in behavior that was present prior to commit 143a1f4f9d876e9d503937c1cd53391d3f771c05 (#2705)

Short description of the changes

• Prior to commit 143a1f4f9d876e9d503937c1cd53391d3f771c05 (#2705), the behavior was as follows:
  • OTEL_RESOURCE_ATTRIBUTES = 'k8s.namespace.name=my-namespace'
  • NAMESPACE is undefined
  • EnvDetector runs and adds 'k8s.namespace.name=my-namespace' to attributes list
  • GcpDetector runs and sets 'k8s.namespace.name=' (blank)

The GcpDetector should only set 'k8s.namespace.name' if the source environment variable is defined.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: pichlermarc / name: Marc Pichler (0017b71344d2978876768a83dc158538b1a98358)
• :white_check_mark: login: ajbenjam / name: Adam Benjamin (d5a0bd1f5cf4c5bca06e4059ec7d5ffb06315d3f)
• :white_check_mark: login: david-luna / name: David Luna (078777bbdde5233c7f85eb5b989d6d2c50fc7548)

[ajbenjam]

/easycla

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.65%. Comparing base (19a2ad5) to head (078777b). Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2755   +/-   ##
=======================================
  Coverage   89.65%   89.65%           
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  Files         185      185           
  Lines        9034     9034           
  Branches     1852     1852           
=======================================
  Hits         8099     8099           
  Misses        935      935           

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