Fix so `Export tool` does not return duplicate data when storage contains multiple experiments with same ensemble names #9897

Job	Run time
Test ert docs (3.12, ubuntu-latest)	1m 57s
test-mac-for-tags	0s
build-wheels (3.10) / build-wheels	41s
build-wheels (3.12) / build-wheels	34s
build-wheels (3.8) / build-wheels	40s
build-wheels (3.11) / build-wheels	37s
test-linux (gui-test, 3.11, ubuntu-latest) / Run ert tests	11m 55s
build-wheels (3.9) / build-wheels	34s
test-linux (gui-test, 3.12, ubuntu-latest) / Run ert tests	12m 41s
test-linux (gui-test, 3.8, ubuntu-latest) / Run ert tests	13m 0s
test-linux (integration-tests, 3.11, ubuntu-latest) / Run ert tests	7m 52s
test-linux (integration-tests, 3.12, ubuntu-latest) / Run ert tests	6m 20s
test-linux (integration-tests, 3.8, ubuntu-latest) / Run ert tests	7m 56s
test-linux (unit-tests, 3.11, ubuntu-latest) / Run ert tests	4m 37s
test-linux (unit-tests, 3.12, ubuntu-latest) / Run ert tests	5m 35s
test-linux (unit-tests, 3.8, ubuntu-latest) / Run ert tests	5m 31s
test-mac (gui-test, 3.12, macos-latest) / Run ert tests	9m 29s
test-mac (integration-tests, 3.12, macos-latest) / Run ert tests	5m 2s
test-mac (unit-tests, 3.12, macos-latest) / Run ert tests	6m 12s
test-slurm (ubuntu-latest, 3.11) / Run ert tests	4m 52s
test-slurm (ubuntu-latest, 3.12) / Run ert tests	5m 15s
test-slurm (ubuntu-latest, 3.8) / Run ert tests	4m 44s
Publish to PyPI	0s
	1h 56m 4s

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