Add cli_lint_errors_count to java descriptor

[ansraliant]

In order to parse the amount of errors Checkstyle finds, we need to tell the parser which type of message the linter responds with.
In case of checkstyle, it has a message like Checkstyle ends with ([0-9]+) errors which corresponds to regex_number. Otherwise megalinter will respond always with 1.

Fixes #
Tries to fix an issue when the count of errors reported by checkstyle are not properly parsed.

Proposed Changes

1. adds cli_lint_errors_count

Readiness Checklist

Author/Contributor

• Add entry to the CHANGELOG listing the change and linking to the corresponding issue (if appropriate)
• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[codecov-commenter]

Codecov Report

Merging #1820 (fd765ac) into main (c1cd385) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1820      +/-   ##
==========================================
+ Coverage   84.26%   84.28%   +0.02%     
==========================================
  Files         162      162              
  Lines        4328     4328              
==========================================
+ Hits         3647     3648       +1     
+ Misses        681      680       -1     

Impacted Files	Coverage Δ
megalinter/reporters/UpdatedSourcesReporter.py	89.74% <0.00%> (+2.56%)	⬆️

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[nvuillam]

Good catch, thanks a lot for your contribution :)