feat: create external trigger for ephemeral index

[radu-mocanu]

• create external trigger for ephemeral index
  depends on fix: index ingestion trigger name uipath-runtime-python#72

Development Package

• Use uipath pack --nolock to get the latest dev build from this PR (requires version range).
• Add this package as a dependency in your pyproject.toml:

[project]
dependencies = [
  # Exact version:
  "uipath==2.6.12.dev1012124355",

  # Any version from PR
  "uipath>=2.6.12.dev1012120000,<2.6.12.dev1012130000"
]

[[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" }

[tool.uv]
override-dependencies = [
    "uipath>=2.6.12.dev1012120000,<2.6.12.dev1012130000",
]