refactor(struct.slt): remove redundant tests covered by existing suites

Author: kosiew

datafusion/sqllogictest/test_files/struct.slt

@@ -492,8 +492,6 @@ Struct("r": Utf8, "c": Float64)
 statement ok
 drop table t;
 
-# Redundant test removed: covered by the 'Struct Casting with Field Reordering' suite
-
 ##################################
 ## Test Coalesce with Struct
 ##################################
@@ -558,7 +556,6 @@ create table t(a struct(r varchar, c int), b struct(r varchar, c float)) as valu
     (row('red', 1), row(2.3, 'blue')),
     (row('purple', 1), row('green', 2.3));
 
-# Redundant test removed: out-of-order struct literal is covered by casting tests below
 
 ##################################
 ## Test Array of Struct
@@ -569,7 +566,6 @@ select [{r: 'a', c: 1}, {r: 'b', c: 2}];
 ----
 [{r: a, c: 1}, {r: b, c: 2}]
 
-# Redundant array literal test removed: covered by the 'Struct Casting with Field Reordering' suite
 
 statement ok
 create table t(a struct(r varchar, c int), b struct(r varchar, c float)) as values (row('a', 1), row('b', 2.3));
@@ -582,7 +578,6 @@ List(Struct("r": Utf8View, "c": Float32))
 statement ok
 drop table t;
 
-# Redundant create/select array-with-different-struct-types test removed: functionality covered by later 'Struct Casting with Field Reordering' table tests
 
 statement ok
 create table t(a struct(r varchar, c int, g float), b struct(r varchar, c float, g int)) as values (row('a', 1, 2.3), row('b', 2.3, 2));