fix: scim 2 filter: the username should be treated case-insensitive (#9257)

# Which Problems Are Solved
- when listing users via scim v2.0 filters applied to the username are
applied case-sensitive

# How the Problems Are Solved
- when a query filter is appleid on the username it is applied
case-insensitive

# Additional Context
Part of https://github.com/zitadel/zitadel/issues/8140

internal/query/search_query_test.go

@@ -905,6 +905,19 @@ func TestNewTextQuery(t *testing.T) {
 				Compare: TextNotEquals,
 			},
 		},
+		{
+			name: "not equal ignore case",
+			args: args{
+				column:  testCol,
+				value:   "h_urst%",
+				compare: TextNotEqualsIgnoreCase,
+			},
+			want: &textQuery{
+				Column:  testCol,
+				Text:    "h\\_urst\\%",
+				Compare: TextNotEqualsIgnoreCase,
+			},
+		},
 		{
 			name: "starts with",
 			args: args{
@@ -1194,6 +1207,28 @@ func TestTextQuery_comp(t *testing.T) {
 				query: sq.ILike{"test_table.test_col": "Hurst"},
 			},
 		},
+		{
+			name: "not equals",
+			fields: fields{
+				Column:  testCol,
+				Text:    "Hurst",
+				Compare: TextNotEquals,
+			},
+			want: want{
+				query: sq.NotEq{"test_table.test_col": "Hurst"},
+			},
+		},
+		{
+			name: "not equals ignore case",
+			fields: fields{
+				Column:  testCol,
+				Text:    "Hurst",
+				Compare: TextNotEqualsIgnoreCase,
+			},
+			want: want{
+				query: sq.NotILike{"test_table.test_col": "Hurst"},
+			},
+		},
 		{
 			name: "equals ignore case wildcard",
 			fields: fields{