Delta Ensemble: Refresh calculated addresses for all realizations

[magnesj]

Fixes #14559

A delta ensemble creates summary addresses for all realizations of the source ensembles, unlike a plain ensemble where addresses are created lazily. RimDeltaSummaryCase::values() uses hasAddress() on both source readers to detect vectors present in only one of the source ensembles, and this check is authoritative once the address set is non-empty.

When a calculation was created after the delta ensemble, RimSummaryCalculationCollection::updateDataDependingOnCalculations() recreated the addresses only for the cases showing tree nodes and for the case with most data objects in each ensemble. The remaining realizations never got the calculated address, so the delta case discarded the vector and only realization 0 was plotted. Reloading the project rebuilt the readers from scratch, which is why all realizations were present after a save and reload.

• Add RifSummaryReaderInterface::refreshCalculatedAddresses(), recreating the addresses of the calculated readers while leaving the native readers untouched. Does nothing if no addresses have been created, so lazily loaded realizations stay lazy.
• RimDeltaSummaryCase rebuilds the union of the source addresses and discards cached values for calculated vectors, as the values may have changed.
• RimSummaryEnsemble::onCalculationUpdated() refreshes the calculated addresses for all cases in the ensemble. No additional file access, as caseWithMostDataObjects() already touches the reader of every case.
• Delta ensembles are updated after the other ensembles, as a delta case derives its addresses from the source cases.

[kriben]

I like it.

Agent found this:

• [P2] Deleting the final calculation leaves stale calculated addresses — ApplicationLibCode/ProjectDataModel/RimSummaryCalculationCollection.cpp:54
  deleteCalculation() calls rebuildCaseMetaData() after removing the calculation, but updateDataDependingOnCalculations() immediately returns when the collection becomes empty. Consequently, the newly added ensemble refresh never runs, leaving deleted calculated addresses in readers and delta-case caches until another refresh or project reload. The test masks this by manually calling refreshCalculatedAddresses() after deletion at ApplicationLibCode/UnitTests/RifMultipleSummaryReaders-Test.cpp:93. Remove or adjust the early return and add an integration-level test for deleting the last calculation.

[magnesj]

Thanks — the P2 finding was correct. deleteCalculation() removes the calculation from the collection before calling rebuildCaseMetaData(), so updateDataDependingOnCalculations() saw an empty collection and returned early. Deleting the last calculation left its addresses behind in the readers until the next refresh or a reload of the project. This was the case before this PR as well, the new ensemble refresh just inherited it.

Removing the early return altogether would force reader creation for every realization of every ensemble on project load when no calculations are present, so the collection now remembers whether the previous update had calculations, and performs one more update after the last one is deleted.

Added RimSummaryCalculationCollection-Test.cpp covering this through the collection, using a call counter on RimMockSummaryCase. Verified that it fails with the original early return and passes with the fix.