(you don't have to strictly follow this form)

**Describe the bug**
When using `ORDER BY column_name COLLATE 'en'`, `COLLATE` is ignored if `column_name` is the primary key
 
**How to reproduce**
* version 21.1.2
* `CREATE TABLE` statements for all tables involved:
```
CREATE TABLE test.test_collation
(
    `v` String,
    `v2` String
)
ENGINE = MergeTree
ORDER BY v
SETTINGS index_granularity = 8192
```
* Sample data:
```
insert into test.test_collation values ('A', 'A')
insert into test.test_collation values ('B', 'B')
insert into test.test_collation values ('C', 'C')
insert into test.test_collation values ('a', 'a')
insert into test.test_collation values ('b', 'b')
insert into test.test_collation values ('c', 'c')
```
* Queries to run that lead to unexpected result
Primary key
```
SELECT *
FROM test.test_collation
ORDER BY v ASC COLLATE 'en'

Query id: fa84ae7a-abe7-4886-99cd-eba7ad5d5fc4

┌─v─┬─v2─┐
│ A │ A  │
│ B │ B  │
│ C │ C  │
│ a │ a  │
│ b │ b  │
│ c │ c  │
└───┴────┘
```
Separate column
```
SELECT *
FROM test.test_collation
ORDER BY v2 ASC COLLATE 'en'

Query id: 04401f85-3cb2-442c-8c89-e3328d1615cd

┌─v─┬─v2─┐
│ a │ a  │
│ A │ A  │
│ b │ b  │
│ B │ B  │
│ c │ c  │
│ C │ C  │
└───┴────┘
```

**Expected behavior**
Both of these queries to return the rows in the same order

{
    /** Find aggregation keys (aggregation_keys), information about aggregate functions (aggregate_descriptions),
     *  as well as a set of columns obtained after the aggregation, if any,
     *  or after all the actions that are usually performed before aggregation (aggregated_columns).
     *
     * Everything below (compiling temporary ExpressionActions) - only for the purpose of query analysis (type output).
     */
    auto * select_query = query->as<ASTSelectQuery>();
    auto temp_actions = std::make_shared<ActionsDAG>(sourceColumns());
    if (select_query)
    {
        NamesAndTypesList array_join_columns;
        columns_after_array_join = sourceColumns();
        bool is_array_join_left;
        if (ASTPtr array_join_expression_list = select_query->arrayJoinExpressionList(is_array_join_left))
        {
            getRootActionsNoMakeSet(array_join_expression_list, true, temp_actions, false);
            auto array_join = addMultipleArrayJoinAction(temp_actions, is_array_join_left);
            auto sample_columns = temp_actions->getResultColumns();
            array_join->prepare(sample_columns);
            temp_actions = std::make_shared<ActionsDAG>(sample_columns);
            NamesAndTypesList new_columns_after_array_join;
            NameSet added_columns;
            for (auto & column : temp_actions->getResultColumns())
            {
                if (syntax->array_join_result_to_source.count(column.name))
                {
                    new_columns_after_array_join.emplace_back(column.name, column.type);