Reduce the number of times `#clean_path_info` is called
Reduce the number of times `#clean_path_info` is called

It's unnecessary to call `#clean_path_info`. It doesn't need to be
called on the path with each extension. This reduces allocations to
`Rack::Utils` in integration tests.

Before `#clean_path_info` from `Rack::Utils` (line 622) was number 2
in top 5 allocations:
```
[["rack/lib/rack/utils.rb", 499, :T_STRING], [51034, 4539, 71559, 0, 12, 1791120]]
[["rack/lib/rack/utils.rb", 662, :T_STRING], [33012, 0, 27930, 0, 1, 1226009]]
[["rails/activesupport/lib/active_support/notifications/fanout.rb", 55, :T_DATA], [29998, 0, 25380, 0, 1, 3230600]]
[["rails/activesupport/lib/active_support/subscriber.rb", 99, :T_STRING], [29996, 0, 25378, 0, 2, 1113840]]
[["rails/activesupport/lib/active_support/notifications/instrumenter.rb", 52, :T_HASH], [29994, 147, 27014, 0, 11, 4897784]]
```

After `#clean_path_info` from `Rack::Utils` (line 622) does not appear
in the top 5 highest allocations:
```
[["rack/lib/rack/utils.rb", 499, :T_STRING], [47617, 2414, 68969, 0, 12, 1667360]]
[["rack/lib/rack/body_proxy.rb", 34, :T_ARRAY], [28230, 0, 26060, 0, 1, 1046800]]
[["rails/activesupport/lib/active_support/notifications/fanout.rb", 55, :T_DATA], [28208, 0, 26042, 0, 1, 3034096]]
[["rails/activesupport/lib/active_support/subscriber.rb", 99, :T_STRING], [28204, 0, 26040, 0, 1, 1046080]]
[["rails/activesupport/lib/active_support/callbacks.rb", 165, :T_DATA], [28200, 0, 26046, 0, 2, 3451800]]
```

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