Add Vitest to proxy server

[kmcginnes]

Description

Adds Vitest to the proxy server and updated some of the TypeScript setup, as well as a few dependency updates.

These are infrastructure tasks that are paving the way for the default connection logic coming in a future PR.

• Update TypeScript, ESLint, Prettier, Vitest to latest
  • Required fixing a few new warnings from Prettier and ESLint
• Add Vitest to proxy server
  • Add simple test of paths
  • Add coverage step for CI
• Move check:types script to each package
• Move proxy server source code files in to ./src/ directory
  • Updated relative path definitions and moved to a separate file for easier mocking
• Update root package.json
  • Add private: true to prevent accidental publishing
  • Add workspaces for slightly better monorepo functionality
  • Add pnpm to the engines section matching other popular monorepo setups

Validation

• Smoke test production build
• Smoke test development build
• Run typical checks and tests

Related Issues

• Part of [Task] Move default connection generation in to server endpoint #507

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 10 lines in your changes missing coverage. Please review.

Project coverage is 15.23%. Comparing base (a86b9b9) to head (f4016e2).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...ges/graph-explorer-proxy-server/src/node-server.ts	0.00%	7 Missing ⚠️
...components/Select/internalComponents/SelectBox.tsx	0.00%	2 Missing ⚠️
...-explorer/src/components/utils/canvas/drawImage.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #555      +/-   ##
==========================================
+ Coverage   14.84%   15.23%   +0.39%     
==========================================
  Files         404      431      +27     
  Lines       20296    21483    +1187     
  Branches      997     1076      +79     
==========================================
+ Hits         3013     3273     +260     
- Misses      17006    17926     +920     
- Partials      277      284       +7     

Flag	Coverage Δ
unittests	15.23% <44.44%> (+0.39%)	⬆️

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[kmcginnes]

We are ignoring that coverage report. The proxy server code had 0 tests until this PR. This is the first time we are running code coverage on it. The numbers are expected to be low.