CI: Report for tagged tests

[algattik]

What this PR changes/adds

• Create a composite action for a generic task to run tests + upload test report XMLs as artifacts
• Merge the two workflows for UT and IT into one (required for the item below)
• Organize the workflow to run UT and ITs in several parallel jobs, and then a final job that combines the result XMLs into one report

Why it does that

GitHub PR test report previously contains only unit tests. With this PR it also includes integration tests.

Further notes

Also merged the two jobs running AWS integration tests into one.

See sample PR with a failing test, showing the report related actions are also executed in that case: agera-edc#212

Linked Issue(s)

Closes #1046

Checklist

• added appropriate tests?
• performed checkstyle check locally?
• added/updated copyright headers?
• documented public classes/methods?
• added/updated relevant documentation?
• added relevant details to the changelog? (skip with label no-changelog)
• formatted title correctly? (take a look at the CONTRIBUTING and styleguide for details)

[codecov-commenter]

Codecov Report

Merging #1115 (33a8107) into main (70ff63d) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1115      +/-   ##
============================================
- Coverage     62.61%   62.61%   -0.01%     
  Complexity     2969     2969              
============================================
  Files           694      694              
  Lines         15416    15416              
  Branches       1044     1044              
============================================
- Hits           9653     9652       -1     
  Misses         5334     5334              
- Partials        429      430       +1     

Impacted Files	Coverage Δ
.../dataspaceconnector/boot/util/TopologicalSort.java	92.85% <0.00%> (-2.39%)	⬇️
...main/contract/negotiation/ContractNegotiation.java	0.00% <0.00%> (ø)
...e/selector/api/DataplaneSelectorApiController.java	100.00% <0.00%> (ø)

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[paullatzelsperger]

removing myself as reviewer since @ndr-brt already reviewed it.

[algattik]

@juliapampus @jimmarino this PR is OK to merge, thanks