fix: Forbid @deephaven modules from self importing

[bmingles]

• Eslint rules to forbid importing from @deephaven package owning the module
• Fixed offending SessionUtils

I tested this by running npm run test:lint. It showed expected linting error before fixing SessionUtils. Fixing SessionUtils made error go away. Also tested in vscode. Error shows up in the editor as expected.

fixes #1497

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01% ⚠️

Comparison is base (d35aa49) 45.76% compared to head (e358402) 45.76%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1499      +/-   ##
==========================================
- Coverage   45.76%   45.76%   -0.01%     
==========================================
  Files         517      517              
  Lines       35162    35164       +2     
  Branches     8802     8804       +2     
==========================================
  Hits        16092    16092              
- Misses      19019    19021       +2     
  Partials       51       51              

Flag	Coverage Δ
unit	45.76% <ø> (-0.01%)	⬇️

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Files Changed	Coverage Δ
packages/jsapi-utils/src/SessionUtils.ts	2.63% <ø> (ø)

... and 1 file with indirect coverage changes

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