Add Dokka documentation to artifacts

[tripolkaandrey]

This PR adds Dokka-generated documentation as a publish artifact.

It is done by using functionality introduced in this PR in config.

Also, while updating the config, the dead code from buildSrc, like the groovy directory, was removed.

Important details

• Breaking changes were introduced in the 2.11.0 version of error_prone_core leading to a compilation error. The 2.10.0 version was forced for all other Error Prone parts to resolve the issue.

• Dokka has an issue when dealing with Metaspace. The problem and its workaround were mentioned in this PR in config. This repository is large enough to run into OutOfSpaceError, so MaxMetaspaceSize was manually set as a parameter to the Gradle build CLI command in build-on-ubuntu and build-on-windows GitHub workflows to overcome the issue.

[codecov]

Codecov Report

Merging #1450 (bee545e) into master (b619573) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1450      +/-   ##
============================================
+ Coverage     91.44%   91.45%   +0.01%     
+ Complexity     4979     4978       -1     
============================================
  Files           626      626              
  Lines         15347    15347              
  Branches        894      894              
============================================
+ Hits          14034    14036       +2     
+ Misses         1006     1004       -2     
  Partials        307      307              

[armiol]

LGTM.