[Infra] Create CI build validation workflows for all languages

[diberry]

Summary

Create fresh GitHub Actions CI build validation workflows for all 5 languages in the repo. This replaces the stale PR #61 which was closed because its branch referenced old directory names that no longer exist on main.

Requirements

Create one workflow per language, each validating compilation of all samples for that language:

Workflows needed:

1. TypeScript (\ ypescript-build.yml):
   osql-vector-search-typescript,
   osql-create-index-typescript\
2. .NET (\dotnet-build.yml):
   osql-vector-search-dotnet\
3. Go (\go-build.yml):
   osql-vector-search-go\
4. Java (\java-build.yml):
   osql-vector-search-java\ — this was missing from PR Add CI build validation workflows for all languages #61
5. Python (\python-build.yml):
   osql-vector-search-python\

Each workflow must:

• Trigger on push to main + PRs, with path filters for that language's file types
• Include \workflow_dispatch\ for manual runs
• Use \permissions: contents: read\ (least privilege)
• Use \ail-fast: true\ in the matrix strategy
• Use latest stable action versions (v4/v5)
• Add dependency caching (\cache:\ parameter on setup actions)
• Reference current
  osql-\ directory names (NOT the old \mongo-vcore-\ names)

Background

• Original issue: create a build script for each language #50
• Closed PR: Add CI build validation workflows for all languages #61 (stale branch, merge conflicts, wrong directory names, missing Java)