Upgrade pip in gitlab ci without using get-pip.py

See merge request pycqa/flake8!411

config: Determine path to user configuration immediately

See merge request pycqa/flake8!409

Preemptively determine the path of the user configuration file during
the construction of the `ConfigFileFinder` object.  The user
configuration path will always be the same, regardless of when it gets
obtained by a run of `flake8`.

This isolates the logic of determining the user configuration path into
a static helper method to be called to set the `.user_config_file`
attribute.  The helper method leverages `utils.is_windows()`, instead of
reimplementing the check, and decomposes clearly the directory name and
the base name to construct the path with a single `return` path.
Additionally, this avoids reconstructing the path on demand of obtaining
the user configuration file path.

config: Remove checks for configs being previously parsed

See merge request pycqa/flake8!408

Remove the checks to see if a configuration file has already been seen
and parsed.  These checks aren't necessary because the entire run of
`flake8` calls these methods *only* once per configuration provided.

Ensure that a not-found file produces an error

Closes #600

See merge request pycqa/flake8!404

document that contents may appear before/after a noqa comment

Closes #528

See merge request pycqa/flake8!407