chore: Flake8 namespace updates

[MikhailKardash]

Description

Update a lot of imports and variables to solve I2041 flake8 issues.

Test Plan

No testing required

Commentary (optional)

Checklist

• [ ] Changes have been manually QA'd
• [ ] User-facing API changes need the "User-facing API Change" label.
• [ ] Release notes should be added as a separate file under docs/release-notes/. See Release Note for details.
• [ ] Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.75540% with 214 lines in your changes are missing coverage. Please review.

Project coverage is 47.07%. Comparing base (2c7d2a1) to head (dd6a59c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8960      +/-   ##
==========================================
- Coverage   47.12%   47.07%   -0.05%     
==========================================
  Files        1153     1154       +1     
  Lines      142358   142272      -86     
  Branches     2421     2421              
==========================================
- Hits        67080    66979     -101     
- Misses      75088    75103      +15     
  Partials      190      190              

Flag	Coverage Δ
backend	42.92% <ø> (-0.01%)	:arrow_down:
harness	64.12% <80.75%> (-0.12%)	:arrow_down:
web	38.95% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
harness/determined/cli/__init__.py	100.00% <100.00%> (ø)
harness/determined/cli/_declarative_argparse.py	97.24% <100.00%> (ø)
harness/determined/cli/_util.py	68.75% <100.00%> (+0.66%)	:arrow_up:
harness/determined/cli/agent.py	24.50% <ø> (-0.74%)	:arrow_down:
harness/determined/cli/checkpoint.py	21.42% <100.00%> (-1.11%)	:arrow_down:
harness/determined/cli/command.py	42.85% <100.00%> (-2.60%)	:arrow_down:
harness/determined/cli/job.py	20.83% <100.00%> (-2.14%)	:arrow_down:
harness/determined/cli/master.py	25.53% <100.00%> (-3.04%)	:arrow_down:
harness/determined/cli/oauth.py	37.50% <ø> (-2.50%)	:arrow_down:
harness/determined/cli/resource_pool.py	31.25% <100.00%> (-2.09%)	:arrow_down:
... and 103 more

... and 1 file with indirect coverage changes