feat: consolidate uipath-core and uipath-platform into monorepo

[radu-mocanu]

Summary

• Restructured uipath-python into a monorepo hosting 3 PyPI packages: uipath, uipath-platform, uipath-core
• Follows the same packages/ layout as uipath-integrations-python
• Each package has its own pyproject.toml, uv.lock, and tests/

What changed

• Moved existing repo content into packages/uipath/
• Added packages/uipath-platform/ (from uipath-platform-python)
• Added packages/uipath-core/ (from uipath-core-python)
• Rewrote all GitHub Actions workflows for multi-package CI/CD:
  • lint-packages.yml / test-packages.yml with per-package change detection
  • cd.yml / publish-dev.yml with matrix build + publish
  • Cross-repo test workflows now build all 3 wheels
  • Added test-uipath-runtime.yml
• Updated labeler.yml for monorepo paths

Manual steps needed after merge

• Add TESTPYPI_TOKEN_PLATFORM and TESTPYPI_TOKEN_CORE secrets
• Add PyPI trusted publishers for uipath-platform and uipath-core pointing to this repo
• Archive uipath-platform-python and uipath-core-python repos

Development Packages

uipath-core

[project]
dependencies = [
  # Exact version:
  "uipath-core==0.5.2.dev1014035135",

  # Any version from PR
  "uipath-core>=0.5.2.dev1014030000,<0.5.2.dev1014040000"
]

[[tool.uv.index]]
name = "testpypi"
url = "https://test.pypi.org/simple/"
publish-url = "https://test.pypi.org/legacy/"
explicit = true

[tool.uv.sources]
uipath-core = { index = "testpypi" }

uipath

[project]
dependencies = [
  # Exact version:
  "uipath==2.10.3.dev1014035135",

  # Any version from PR
  "uipath>=2.10.3.dev1014030000,<2.10.3.dev1014040000"
]

[[tool.uv.index]]
name = "testpypi"
url = "https://test.pypi.org/simple/"
publish-url = "https://test.pypi.org/legacy/"
explicit = true

[tool.uv.sources]
uipath = { index = "testpypi" }