(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

{
    if (auto * table = analyzed_join->joined_storage.get())
        if (auto * storage_join = dynamic_cast<StorageJoin *>(table))
            return storage_join->getJoinLocked(analyzed_join);
    return {};
}
static ExpressionActionsPtr createJoinedBlockActions(ContextPtr context, const TableJoin & analyzed_join)
{
    ASTPtr expression_list = analyzed_join.rightKeysList();
    auto syntax_result = TreeRewriter(context).analyze(expression_list, analyzed_join.columnsFromJoinedTable());
    return ExpressionAnalyzer(expression_list, syntax_result, context).getActions(true, false);
}
static bool allowDictJoin(StoragePtr joined_storage, ContextPtr context, String & dict_name, String & key_name)
{
    const auto * dict = dynamic_cast<const StorageDictionary *>(joined_storage.get());
    if (!dict)
        return false;
    dict_name = dict->dictionaryName();
    auto dictionary = context->getExternalDictionariesLoader().getDictionary(dict_name, context);
    if (!dictionary)
        return false;
    const DictionaryStructure & structure = dictionary->getStructure();
    if (structure.id)
    {
        key_name = structure.id->name;
        return true;
    }
    return false;
}
static std::shared_ptr<IJoin> makeJoin(std::shared_ptr<TableJoin> analyzed_join, const Block & sample_block, ContextPtr context)