(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_analyzer.getSelectQuery();
            for (const auto & child : select_query->select()->children)
            {
                step.addRequiredOutput(child->getColumnName());
            }
        }
        selected_columns.clear();
        selected_columns.reserve(chain.getLastStep().required_output.size());
        for (const auto & it : chain.getLastStep().required_output)
            selected_columns.emplace_back(it.first);
        has_order_by = query.orderBy() != nullptr;
        before_order_by = query_analyzer.appendOrderBy(
                chain,
                only_types || (need_aggregate ? !second_stage : !first_stage),
                optimize_read_in_order,
                order_by_elements_actions);
        if (query_analyzer.appendLimitBy(chain, only_types || !second_stage))
        {
            before_limit_by = chain.getLastActions();
            chain.addStep();
        }
        final_projection = query_analyzer.appendProjectResult(chain);
        finalize_chain(chain);
    }
    
    removeExtraColumns();
    checkActions();
}
void ExpressionAnalysisResult::finalize(const ExpressionActionsChain & chain, size_t where_step_num, const ASTSelectQuery & query)