fix(api,robot-server): upgrade pydantic, upgrade and add test dev deps

[mcous]

Overview

This PR is here to solve a few issues in our Python stack, one of which is blocking and the rest of which are just annoying.

Main reason for PR:

• We need (want?) Pydantic available in api to move neutral protocol engine stuff into api where it can live closer to other protocol-related stuff
  • Upgraded to latest Pydantic for important features around default field values Update: blocked on this upgrade, need to stick to Pydantic 1.4.0 for now
  • Will require buildroot update: feat: upgrade package/python-pydantic to 1.6.1 buildroot#107

Additional stuff in PR:

• Upgraded pytest to latest
• Upgraded tavern to latest (current version can hide test that should be failing, see test(robot-server): fix query params and remove strict: false in some tavern tests #6665
• Added mock package to get access to the Python 3.7 backport of AsyncMock
• Added pytest-watch package to have watch mode for pytest

Why did I lump a bunch of disparate stuff into one PR? Because every single call to pipenv install on my machine takes 2 minutes and most of them require me to rm -rf Pipfile.lock to get the commands to actually succeed. I decided to put them all in one PR for my own sanity and because lockfile changes are scary and I don't want to deal with them more than once.

Changelog

See above.

Review requests

• All tests and checks should still pass locally
• Pydantic upgrade most affects robot-server, so whatever smoke tests you can do are helpful there

Risk assessment

Medium, in the grand scheme of things. Deep dependency issues are problems that we've run into in the past. Does not affect production dependencies on the OT-2 because those are controlled by buildroot

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (edge@eb906a3). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             edge    #6673   +/-   ##
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  Coverage        ?   80.44%           
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  Files           ?      248           
  Lines           ?    21221           
  Branches        ?        0           
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  Hits            ?    17072           
  Misses          ?     4149           
  Partials        ?        0           

Impacted Files	Coverage Δ
...pdate-server/otupdate/buildroot/name_management.py	29.50% <ø> (ø)
...rver/robot/calibration/tip_length/state_machine.py	92.30% <0.00%> (ø)
opentrons/drivers/mag_deck/driver.py	37.55% <0.00%> (ø)
.../robot/calibration/pipette_offset/state_machine.py	92.30% <0.00%> (ø)
...rver/robot_server/service/pipette_offset/models.py	100.00% <0.00%> (ø)
opentrons/protocols/api_support/util.py	91.26% <0.00%> (ø)
...r/robot_server/robot/calibration/deck/constants.py	95.45% <0.00%> (ø)
opentrons/protocols/execution/json_dispatchers.py	85.71% <0.00%> (ø)
opentrons/legacy_api/robot/mover.py	88.63% <0.00%> (ø)
...rver/robot_server/service/session/models/common.py	100.00% <0.00%> (ø)
... and 239 more

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[sfoster1]

See comment, need to keep the api (and shared-data, though no changes here require it)'s setup.py in sync with the non-dev package dependencies for pypi distribution

[sfoster1]

lgtm!

[amitlissack]

Nice!