fix(tests): clean documents when IntegrationContext.StoreOptions builds a store (#398)

[jeremydmiller]

Closes #398.

The problem

IntegrationContext.StoreOptions(...) applied schema changes but never removed data, so every test routed through it inherited whatever earlier runs left in its schema. The suite isolates by DatabaseSchemaName inside one shared master database rather than by database, so that residue survives across runs indefinitely and any test asserting on an absolute count drifts upward.

The reported symptom — single_tenant_has_no_tenant_id_column_tests.full_lifecycle_works_without_tenant_id_column seeing byLinq.Count grow 1 → 2 → 3 across successive local runs — is local-only, because CI provisions a fresh SQL Server per run. That is what made it confusing: it presents as a flaky assertion in an area the developer did not touch.

The fix

StoreOptions now empties the configured schema's document tables after applying the schema, through the store's own Advanced.Clean.DeleteAllDocumentsAsync().

Deleting rows rather than dropping the schema (Marten's OneOffConfigurationsContext does drop schema … cascade) is deliberate: a Polecat StoreOptions call that does not set DatabaseSchemaName lands on the shared dbo schema, and dropping that would take the fixture's own tables with it.

The audit the issue asked for

Worth auditing which other StoreOptions callers assert on absolute counts before choosing.

With cleanAll defaulting to true the count question is moot — every caller gets a clean slate. The audit that actually matters is the inverse: which tests depend on pre-existing data surviving into the store. A scan of all 222 StoreOptions call sites for a data write earlier in the same test method found exactly two, and a full-suite run confirmed the same two and no others:

• document_range_partitioning_tests.additive_boundary_rolls_a_new_partition_forward_without_losing_data — reconfigures mid-test; the whole point is that an in-place SPLIT RANGE preserves the row written under the previous configuration.
• strong_typed_id_column_type_tests.migrates_legacy_varchar_id_column_in_place_preserving_data — seeds a legacy varchar(250) id row through a raw connection before StoreOptions, then asserts the in-place id conversion preserved it.

Both now pass cleanAll: false, matching Marten's opt-out parameter of the same name.

Verification

Full Polecat.Tests suite locally against the dockerized SQL Server 2025, net10.0:

• before the opt-outs: 1638 total, 1 failed (the strong_typed_id case above), 1634 passed, 3 skipped — i.e. the change caused exactly one regression, which is now fixed
• the originally-reported class passes on three consecutive runs against the same non-fresh database, which was the actual bug

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