Google output resource to labels

[jsirianni]

Description of Changes

Google Output operator relies on managed resources, which have a static set of resources and resources.labels. This causes any Stanza entry.Resources to be wiped out.

I have not found a way to use managed resources and preserve stanza's resources, so my solution involves moving stanza's resources to the cloud logging labels.

This works by checking to see if the label already exists, adding it if not. A warning is logged if a label already exists with a different value, to protect against data loss. I think this would be a rare situation.

Before

After

Please check that the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Add a changelog entry (for non-trivial bug fixes / features)
• CI passes

[codecov]

Codecov Report

Merging #425 (1711afd) into master (30f6818) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #425      +/-   ##
==========================================
- Coverage   72.71%   72.65%   -0.05%     
==========================================
  Files         124      124              
  Lines        8152     8158       +6     
==========================================
  Hits         5927     5927              
- Misses       1716     1721       +5     
- Partials      509      510       +1     

Impacted Files	Coverage Δ
...perator/builtin/output/googlecloud/google_cloud.go	57.64% <0.00%> (-1.76%)	⬇️

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