processor/otel: add unit test for span status

[axw]

Motivation/summary

Add a unit test to show the mapping from span status codes to transaction/span outcome and transaction result.

How to test these changes

Non-functional change.

Related issues

Closes #4716

[codecov-io]

Codecov Report

Merging #4734 (b04a57b) into master (6d8ad81) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4734      +/-   ##
==========================================
+ Coverage   76.65%   76.69%   +0.03%     
==========================================
  Files         166      166              
  Lines       10211    10211              
==========================================
+ Hits         7827     7831       +4     
+ Misses       2384     2380       -4     

Impacted Files	Coverage Δ
...ack/apm-server/aggregation/txmetrics/aggregator.go	93.36% <0.00%> (ø)
processor/otel/consumer.go	95.74% <0.00%> (+0.85%)	⬆️

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #4734 opened

• Start Time: 2021-02-16T03:51:40.316+0000

• Duration: 40 min 28 sec

• Commit: b04a57b

Test stats 🧪

Test	Results
Failed	0
Passed	4736
Skipped	124
Total	4860

Trends 🧪

Steps errors

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• Description: tar --exclude=system-tests-linux-files.tgz -czf system-tests-linux-files.tgz system-tests

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• Description: ./.ci/scripts/sync.sh