feat(manager/poetry): add support for explicit sources

[Churro]

Changes

• Extends parsing of Poetry package sources by name and priority
  • Extracted registry URLs are ordered in the way poetry visits them (see docs)
• Adds support for packages with explicit sources.

Newly added tests cover the same scenarios that are also covered by poetry-internal tests (see here).

Context

• Closes Explicit source of Poetry managed Python dependency is not supported #12003
• Closes Renovatebot not looking up private python registry #23714

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

Test repo: renovate-demo/12003-poetry-source#2

Logs with only https://christopherfrieler.github.io/renovate-issue-12003/ in registryUrls but no PyPI

DEBUG: packageFiles with updates (repository=renovate-demo/12003-poetry-source, baseBranch=master)
"config": {
  "poetry": [
   {
     "deps": [
       {
         "datasource": "pypi",
         "managerData": {
           "nestedVersion": true,
           "sourceName": "my-package-index"
         },
         "currentValue": "1.0.0",
         "versioning": "pep440",
         "depName": "some_dependency",
         "packageName": "some-dependency",
         "depType": "dependencies",
         "registryUrls": [
           "https://christopherfrieler.github.io/renovate-issue-12003/"
         ],
         "lockedVersion": "1.0.0",
         "updates": [
           {
             "bucket": "non-major",
             "newVersion": "1.1.0",
             "newValue": "1.1.0",
             "newMajor": 1,
             "newMinor": 1,
             "updateType": "minor",
             "branchName": "renovate/some_dependency-1.x"
           }
         ],
         "warnings": [],
         "registryUrl": "https://christopherfrieler.github.io/renovate-issue-12003",
         "currentVersion": "1.0.0",
         "isSingleVersion": true,
         "fixedVersion": "1.0.0"
       }
     ],
     "registryUrls": [
       "https://christopherfrieler.github.io/renovate-issue-12003/",
       "https://pypi.org/pypi/"
     ],
     "extractedConstraints": {"python": "~3.8"},
     "lockFiles": ["poetry.lock"],
     "packageFile": "pyproject.toml"
   }
  ]
}

[renovate-release]

🎉 This PR is included in version 37.102.0 🎉

The release is available on:

• GitHub release
• 37.102.0

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