Revert "Backport ClickHouse#89395 to 25.8: Revert "Do not perform PrimaryKeyExpand step if skip index is already part of primary key""

Author: shankar-iyer

src/Core/Settings.cpp

@@ -1497,16 +1497,6 @@ Using skip indexes may exclude rows (granules) containing the latest data which
 
 Possible values:
 
-- 0 — Disabled.
-- 1 — Enabled.
-)", 0) \
-    DECLARE(Bool, use_skip_indexes_on_data_read, false, R"(
-Enable using data skipping indexes during data reading.
-
-When enabled, skip indexes are evaluated dynamically at the time each data granule is being read, rather than being analyzed in advance before query execution begins. This can reduce query startup latency.
-
-Possible values:
-
 - 0 — Disabled.
 - 1 — Enabled.
 )", 0) \