docs: fix remaining conductor-sdk org links (csproj + e2e script)

[nthmost-orkes]

Fixes conductor-oss/getting-started#26

The README "Next:" link this PR originally fixed was already resolved by the README rewrite on main, so that change is now dropped (README is byte-identical to main). Repurposed to clean up the old-org references that still linger elsewhere in the repo:

• RepositoryUrl in all five .csproj files (Conductor, Conductor.AI, Conductor.AI.OpenAI, Conductor.AI.GoogleADK, Conductor.AI.SemanticKernel) → https://github.com/conductor-oss/csharp-sdk
• The bundle-README link in scripts/package-e2e-bundle.sh → conductor-oss/csharp-sdk

Left intact: docs/examples.md links to conductor-sdk/conductor-examples, which is a different repo that has not moved orgs, and the unrelated User-Agent = "conductor-sdk" string in an example.

User impact: NuGet package pages and the published e2e-test bundle README pointed users at the dead conductor-sdk/conductor-csharp repo. They now link to the live conductor-oss/csharp-sdk home.

[codecov]

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unittests	20.02% <ø> (+0.07%)	⬆️

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Codecov Report

✅ All modified and coverable lines are covered by tests.
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Flag	Coverage Δ
unittests	20.02% <ø> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.
see 5 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[nthmost-orkes]

Update: reopened and repurposed instead of closing.

The README "Next:" link this PR originally fixed was already resolved by the README rewrite on main, so that change is dropped (README is now byte-identical to main). But the old conductor-sdk/conductor-csharp org string still lingered elsewhere in the repo, so this PR now cleans those up:

• RepositoryUrl in all 5 .csproj files → https://github.com/conductor-oss/csharp-sdk
• The bundle-README link in scripts/package-e2e-bundle.sh

Left intact: docs/examples.md → conductor-sdk/conductor-examples (a different repo that has not moved orgs) and the unrelated User-Agent = "conductor-sdk" example string.