feat(upstream-proxy): add HTTP Basic and NTLM auth methods

[Andreybest]

Description

Added HTTP Basic and NTLM authentication methods for upstream proxy.

HTTP Basic was already available by providing username:password in url of proxy, now it is also can be passed in auth param in proxy.config.json.

NTLM was added, tested on local docker squid + samba proxy. But not sure if it is the sme as the one on windows production proxy environments. Would appreciate testing/suggestions on that :)

Negotiate was omitted because support for it has already been merged into the https-proxy-agent package upstream, but a new release containing it hasn't been published yet.

Related Issue

Resolves #1541 (partially)

Checklist

General

• I have read the CONTRIBUTING.md guidelines
• Commit messages follow Conventional Commits format
• I have a FINOS CLA on file

Documentation

• Documentation has been added/updated for any new features

Configuration

• If configuration schema (config.schema.json) was modified:
  • TypeScript types regenerated (npm run generate-config-types)
  • Schema reference docs regenerated (npm run gen-schema-doc)

Tests

• Tests have been added/updated for new functionality
• Unit tests pass (npm test)
• Linting and formatting pass (npm run lint and npm run format:check)
• Type checks pass (npm run check-types)

[netlify]

✅ Deploy Preview for endearing-brigadeiros-63f9d0 canceled.

Name	Link
🔨 Latest commit	e1b4df0
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[codecov]

Codecov Report

❌ Patch coverage is 85.13514% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.43%. Comparing base (ffd6937) to head (e1b4df0).

Files with missing lines	Patch %	Lines
src/proxy/upstream/ntlm-proxy-agent.ts	83.05%	29 Missing and 1 partial ⚠️
src/proxy/routes/index.ts	93.33%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1551      +/-   ##
==========================================
- Coverage   90.65%   90.43%   -0.22%     
==========================================
  Files          69       70       +1     
  Lines        5690     5906     +216     
  Branches      985     1034      +49     
==========================================
+ Hits         5158     5341     +183     
- Misses        514      546      +32     
- Partials       18       19       +1     

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