bump version to 7.10.2

[jalvz]

Motivation/summary

Checklist

• I have signed the Contributor License Agreement.
• I have updated CHANGELOG.asciidoc

I have considered changes for:

• documentation
• logging (add log lines, choose appropriate log selector, etc.)
• metrics and monitoring (create issue for Kibana team to add metrics to visualizations, e.g. Kibana#44001)
• automated tests (add tests for the code changes, all unit tests pass locally)
• telemetry
• Elasticsearch Service (https://cloud.elastic.co)
• Elastic Cloud Enterprise (https://www.elastic.co/products/ece)
• Elastic Cloud on Kubernetes (https://www.elastic.co/elastic-cloud-kubernetes)

How to test these changes

Related issues

[codecov-io]

Codecov Report

Merging #4462 (b90e495) into 7.10 (2d6a7e1) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             7.10    #4462      +/-   ##
==========================================
- Coverage   80.21%   80.16%   -0.06%     
==========================================
  Files         158      158              
  Lines        8660     8660              
==========================================
- Hits         6947     6942       -5     
- Misses       1713     1718       +5     

Impacted Files	Coverage Δ
elasticsearch/client.go	42.02% <ø> (ø)
beater/api/root/handler.go	87.50% <100.00%> (ø)
kibana/connecting_client.go	61.40% <0.00%> (-8.78%)	⬇️

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Branch indexing

• Start Time: 2020-12-08T02:50:19.403+0000

• Duration: 30 min 34 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4053
Skipped	142
Total	4195

Steps errors

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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

[simitt]

I am not sure mixing beatversion build information and APM Server version is the best thing to do, but I don't have a better solution right now. When starting APM Server it still shows that libbeat is running with 7.10.1 which is true, so I suggest to upgrade to latest libbeat as soon as they have bumped the version.

[simitt]

Due to missing permissions to push updates to @jalvz's branch I had to create a new PR #4500 to get all changes in.