separate tags with commas as indicated in action doc

[gortiz]

@erichgess found that #10528 broke the codecov coverate.

There were two issues:

• Metadata was wrong. Instead of separating tags, it created huge tags that concatenated all properties. That is being fixed as indicated in https://github.com/codecov/codecov-action (tags should be separated by commas).
• Jacoco wasn't actually added to surefire because $argLine expression indicates that argLine should be eagerly evaluated before applying previous plugins. By changing that to @argLine, it can be evaluated after jacoco plugin modifies the property, as explained in the official doc.

[codecov-commenter]

Codecov Report

Merging #11303 (59c5096) into master (6fa4268) will increase coverage by 67.85%.
Report is 5 commits behind head on master.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master   #11303       +/-   ##
=============================================
+ Coverage      0.11%   67.96%   +67.85%     
- Complexity        0     6508     +6508     
=============================================
  Files          2231     2231               
  Lines        120139   120152       +13     
  Branches      18218    18218               
=============================================
+ Hits            137    81662    +81525     
+ Misses       119982    32663    -87319     
- Partials         20     5827     +5807     

Flag	Coverage Δ
integration1	20.77% <ø> (?)
integration1temurin11	?
integration1temurin17	?
integration1temurin20	?
integration2	25.45% <ø> (?)
integration2temurin11	?
integration2temurin17	?
integration2temurin20	?
java-11	14.41% <ø> (?)
java-17	65.53% <ø> (?)
java-20	33.63% <ø> (?)
temurin	67.96% <ø> (?)
unittests1	66.85% <ø> (?)
unittests1temurin11	?
unittests1temurin17	?
unittests1temurin20	?
unittests2	14.41% <ø> (?)
unittests2temurin11	?
unittests2temurin17	?
unittests2temurin20	?

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see 1932 files with indirect coverage changes

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