internal/apmschema: sync new jsonschema

[simitt]

• Update to latest, simplified JSON schema
• Adapt generator script

[codecov-io]

Codecov Report

Merging #864 (0ba1534) into master (46c67f3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #864   +/-   ##
=======================================
  Coverage   83.70%   83.70%           
=======================================
  Files         142      142           
  Lines        7934     7934           
=======================================
  Hits         6641     6641           
  Misses        885      885           
  Partials      408      408           

Impacted Files	Coverage Δ
internal/apmschema/schema.go	64.70% <100.00%> (ø)

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[apmmachine]

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Build stats

• Build Cause: Pull request #864 opened

• Start Time: 2020-12-28T11:06:31.107+0000

• Duration: 24 min 12 sec

Test stats 🧪

Test	Results
Failed	0
Passed	7661
Skipped	188
Total	7849