[7.12] Disable sourcemap upload endpoint when data streams enabled (#4735)

[axw]

Backports the following commits to 7.12:

• Disable sourcemap upload endpoint when data streams enabled (Disable sourcemap upload endpoint when data streams enabled #4735)

[codecov-io]

Codecov Report

Merging #4849 (388d4c8) into 7.12 (e796c05) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             7.12    #4849      +/-   ##
==========================================
- Coverage   76.77%   76.73%   -0.05%     
==========================================
  Files         166      166              
  Lines       10232    10234       +2     
==========================================
- Hits         7856     7853       -3     
- Misses       2376     2381       +5     

Impacted Files	Coverage Δ
beater/api/mux.go	91.83% <100.00%> (+0.17%)	⬆️
kibana/connecting_client.go	68.75% <0.00%> (-7.82%)	⬇️

[apmmachine]

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Build stats

• Build Cause: Pull request #4849 opened

• Start Time: 2021-02-20T01:42:46.616+0000

• Duration: 39 min 15 sec

• Commit: 388d4c8

Test stats 🧪

Test	Results
Failed	0
Passed	4496
Skipped	126
Total	4622

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Compress

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• Description: tar --exclude=coverage-files.tgz -czf coverage-files.tgz coverage

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

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• Took 3 min 11 sec . View more details on here
• Description: ./.ci/scripts/sync.sh