feat(sdk): detect PR context on GitHub Enterprise, self-managed GitLab and Azure DevOps Server (#241)

[xping-admin]

Closes #241 (SDK side). The Cloud side is a separate dashboard PR that bumps to the package this publishes.

What changes for users

PR builds on GitHub Enterprise Server, GHE.com, self-managed GitLab and Azure DevOps Server now get PR context instead of being filed as plain branch runs.

How

• PullRequestContext.ServerUrl: the server the repository lives on, normalized to scheme, lowercase host, non-default port and path, with no trailing /. The same repo gets the same value from every detector.
• GitHub Actions: GITHUB_SERVER_URL. A missing value still warns.
• GitLab: CI_SERVER_URL replaces CI_SERVER_HOST, so the port and relative root are kept.
• Azure Pipelines:
  • GitHub / GitHubEnterprise providers: the server comes from BUILD_REPOSITORY_URI.
  • TfsGit: Azure DevOps Server collections are accepted, with owner {collection}/{project}.
  • dev.azure.com and *.visualstudio.com both map to https://dev.azure.com.
• Jenkins: the platform is read from the CHANGE_URL path shape on any host:
  • /pull/n is GitHub, /-/merge_requests/n is GitLab, /_git/r/pullrequest/n is Azure Repos.
  • Gitea pulls and Bitbucket pull-requests still return null.
  • Known limit: a GitLab relative URL root lands in the owner.
• CI.ServerUrl is now set on GitHub Actions, GitLab, Azure Pipelines and Bitbucket, so CI.Repository is no longer ambiguous across servers (CI.Repository has no host, so GitHub Enterprise runs can be matched to github.com repos #240).
• Docs: configuration-reference.md and ci-cd-setup.md. They now say PR comments are github.com-only; that's tracked on the Cloud side.

Tests

• The tests that asserted the GHES / self-managed skips now assert success and the expected ServerUrl.
• New tests cover the normalizer, the Azure DevOps Server and GitHubEnterprise paths, self-hosted Jenkins CHANGE_URLs, and CI.ServerUrl per platform.
• The Jenkins parity tests now also compare ServerUrl.
• dotnet build -c Release is clean, dotnet format --verify-no-changes passes, and all six test projects pass.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 98.97959% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...vices/Environment/Internals/EnvironmentDetector.cs	92.30%	0 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
...Sdk.Core/Models/PullRequests/PullRequestContext.cs	100.00% <100.00%> (ø)
...equest/Internals/AzureDevOpsPullRequestDetector.cs	100.00% <100.00%> (ø)
...PullRequest/Internals/GitHubPullRequestDetector.cs	99.00% <100.00%> (-0.04%)	⬇️
...PullRequest/Internals/GitLabPullRequestDetector.cs	100.00% <100.00%> (ø)
...ullRequest/Internals/JenkinsPullRequestDetector.cs	100.00% <100.00%> (ø)
...es/PullRequest/Internals/PullRequestEnvironment.cs	100.00% <100.00%> (ø)
...vices/Environment/Internals/EnvironmentDetector.cs	72.75% <92.30%> (+1.69%)	⬆️

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