Fix SQLite ExecuteUpdate with navigation properties and TPT inheritance

[Copilot]

SQLite doesn't support referencing the UPDATE target table in JOIN ON clauses within UPDATE...FROM. This breaks ExecuteUpdate when navigation properties or TPT inheritance produce JOINs that reference the target table in their ON predicates.

-- Generated SQL that fails on SQLite:
UPDATE "Animals" AS "a"
SET "Name" = @p
FROM "Birds" AS "b"
INNER JOIN "Kiwi" AS "k" ON "a"."Id" = "k"."Id"  -- "a" not resolvable here
WHERE "a"."Id" = "b"."Id"

Changes

• SqliteQuerySqlGenerator.VisitUpdate — For multi-table UPDATEs, emits the target table without alias and lifts JOIN predicates that reference the target into the WHERE clause, converting those JOINs to comma-separated tables
• SqliteQuerySqlGenerator.VisitTable — Suppresses alias generation for the UPDATE target table
• SqliteQuerySqlGenerator.VisitColumn — Replaces column references to the target alias with the actual table name
• ReferencesTargetTable — Walks JOIN predicates to detect references to the target table alias

-- Fixed SQL:
UPDATE "Animals"
SET "Name" = @p
FROM "Birds" AS "b", "Kiwi" AS "k"
WHERE "Animals"."Id" = "k"."Id" AND "Animals"."Id" = "b"."Id"

Test changes

• Updated SQL baselines across NorthwindBulkUpdatesSqliteTest, NonSharedModelBulkUpdatesSqliteTest, and TPT inheritance test files
• TPTInheritanceBulkUpdatesSqliteTest / TPTFiltersInheritanceBulkUpdatesSqliteTest: replaced Assert.ThrowsAsync<SqliteException> with proper execution + baseline assertions for Update_base_property_on_derived_type and Update_base_type_with_OfType

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