[7.12] Add service name to dataset field (#4674)

[axw]

Backports the following commits to 7.12:

• Add service name to dataset field (Add service name to dataset field #4674)

[codecov-io]

Codecov Report

Merging #4847 (144d9d1) into 7.12 (e796c05) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             7.12    #4847      +/-   ##
==========================================
- Coverage   76.77%   76.77%   -0.01%     
==========================================
  Files         166      166              
  Lines       10232    10237       +5     
==========================================
+ Hits         7856     7859       +3     
- Misses       2376     2378       +2     

Impacted Files	Coverage Δ
datastreams/servicename.go	100.00% <ø> (ø)
model/error.go	98.59% <100.00%> (+<0.01%)	⬆️
model/metricset.go	95.16% <100.00%> (+0.07%)	⬆️
model/profile.go	100.00% <100.00%> (ø)
model/span.go	93.18% <100.00%> (+0.07%)	⬆️
model/transaction.go	96.22% <100.00%> (+0.07%)	⬆️
x-pack/apm-server/sampling/processor.go	78.63% <0.00%> (-0.91%)	⬇️
...ack/apm-server/aggregation/txmetrics/aggregator.go	93.36% <0.00%> (ø)

[apmmachine]

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Build stats

• Build Cause: Branch indexing

• Start Time: 2021-02-20T02:50:18.170+0000

• Duration: 44 min 52 sec

• Commit: 144d9d1

Test stats 🧪

Test	Results
Failed	0
Passed	4493
Skipped	126
Total	4619

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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