`yarn install` doesn't install enough things to make `yarn lint` work

[mstange]

The flake8 and lint-python commands fail when I run yarn install && yarn lint on a fresh clone:

% yarn lint
yarn run v1.22.22
$ run-p lint-js lint-python prettier-run
$ prettier --check .
$ flake8 tools loadtest
$ eslint src bin test
/bin/sh: flake8: command not found
error Command failed with exit code 127.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
ERROR: "lint-python" exited with 127.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this c

[canova]

I never use yarn lint and always use yarn lint-js. I guess the problem is that flake8 has to be installed through pip instead of npm.
As far as I know python code is only used by some load tests and some scripts that are not as part of the server itself. So I don't bother running lint-python.

[mstange]

Ah yes, I should have just run yarn prettier-run because that was what it said on the CI failure we were looking at. Ok makes sense.