[7.15] Adjust SearchableSnapshotsBlobStoreCacheIntegTests.testBlobStoreCache #77844
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This test sometimes fails (#77753) when it tries to refresh the
snapshot blob cache index while it wasn't created at all due to
the test index being completely empty with 0 documents indexed.
Having an empty index in this test does not make much sense
because the index will contain no segments and therefore no
segments file to cache in the system index.
This commit adjusts the test to always index at least
some docs.
Backport of #77758