(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

{
    const auto * select_query = query->as<ASTSelectQuery>();
    if (!select_query)
        throw Exception("Not a select query", ErrorCodes::LOGICAL_ERROR);
    return select_query;
}
const ASTSelectQuery * SelectQueryExpressionAnalyzer::getAggregatingQuery() const
{
    if (!has_aggregation)
        throw Exception("No aggregation", ErrorCodes::LOGICAL_ERROR);
    return getSelectQuery();
}
ArrayJoinActionPtr ExpressionAnalyzer::addMultipleArrayJoinAction(ActionsDAGPtr & actions, bool array_join_is_left) const
{
    NameSet result_columns;
    for (const auto & result_source : syntax->array_join_result_to_source)
    {
        
        if (result_source.first != result_source.second)
        {
            const auto & node = actions->findInIndex(result_source.second);
            actions->getIndex().push_back(&actions->addAlias(node, result_source.first));
        }
        
        result_columns.insert(result_source.first);
    }
    return std::make_shared<ArrayJoinAction>(result_columns, array_join_is_left, getContext());
}
ArrayJoinActionPtr SelectQueryExpressionAnalyzer::appendArrayJoin(ExpressionActionsChain & chain, ActionsDAGPtr & before_array_join, bool only_types)