WIP add PR workflow for Nessie/Iceberg integration testing

[snazy]

NOTE: This PR, actually the integrations-testing stuff it uses, is very much work-in-progress

It relies on the state in https://github.com/snazy/nessie-integration-tests/ - and that piece is changing rapidly. It is at least the foundation of Nessie-Query-Engine-Integration-Tests - i.e. to allow testing various query engines using Nessie against various environments.

See #4737

To merge this PR:

• all above bullet-points "checked"
• [ ] the nessie-integration-tests repo needs to be in projectnessie
• [ ] need a branch in projectnessie/nessie that contains the patches for Nessie to make it work against "latest Iceberg"
• [ ] need a (temporary) fork of apache/iceberg - but only apply the Iceberg PRs https://github.com/apache/iceberg/pull/5051 and https://github.com/apache/iceberg/pull/5193 - however, maybe we need a "permanent patch branch"

[codecov[bot]]

Codecov Report

Merging #4686 (b5f63c9) into main (eb452df) will decrease coverage by 0.16%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4686      +/-   ##
==========================================
- Coverage   82.86%   82.70%   -0.17%     
==========================================
  Files          31       49      +18     
  Lines        1436     1758     +322     
  Branches      249      338      +89     
==========================================
+ Hits         1190     1454     +264     
- Misses        179      226      +47     
- Partials       67       78      +11     

Flag	Coverage Δ
java	∅ <ø> (?)
javascript	81.98% <ø> (?)
python	82.86% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
ui/src/NavBar/NavBar.tsx	100.00% <0.00%> (ø)
ui/src/EmptyMessageView/EmptyMessageView.tsx	100.00% <0.00%> (ø)
ui/src/ConfigLog4j.ts	100.00% <0.00%> (ø)
ui/src/index.tsx	0.00% <0.00%> (ø)
ui/src/TableListing/TableListing.tsx	93.10% <0.00%> (ø)
ui/src/App.tsx	82.45% <0.00%> (ø)
ui/src/Contents/Contents.tsx	16.66% <0.00%> (ø)
ui/src/utils/api-wrapper.tsx	100.00% <0.00%> (ø)
ui/src/ContentView/ContentView.tsx	93.93% <0.00%> (ø)
ui/src/NotFound/NotFound.tsx	100.00% <0.00%> (ø)
... and 8 more

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[dimas-b]

Is the description still up-to-date? This link in particular seems to be broken: https://github.com/snazy/nessie-integration-tests/

[snazy]

just looks like nothing may have been tested (or at least i didnt find a test summary or the like)

all actual tests are integration tests - via 'intTest`

[XN137]

all actual tests are integration tests - via 'intTest`

my point was that the gradle build gives no feedback on what / how many tests have been executed