test: fix vacuous is_err() assertions in runtime extension tests

[github-actions]

Test Suite Reduction: src/runtimes/ extension tests

What was wrong

Six tests across the node, python, and dotnet runtime extensions used bare assert!(ext.declarations(...).is_err()). A bare is_err() assertion only confirms that some error was returned — it would pass even if a completely unrelated error fired (e.g. a parse error, a panic converted to anyhow, or an unrelated validation failure). None of these tests verified the error was actually the expected one for the scenario they described.

Changes

File	Test	Action	Reason
src/runtimes/node/extension.rs	test_validate_invalid_feed_url_rejected	Rewritten	bare is_err() → unwrap_err() + assert message contains https:// scheme text and runtimes.node.feed-url
src/runtimes/node/extension.rs	test_validate_version_injection_rejected	Rewritten	bare is_err() → unwrap_err() + assert message contains ADO expression and runtimes.node.version
src/runtimes/python/extension.rs	test_validate_invalid_feed_url_rejected	Rewritten	bare is_err() → unwrap_err() + assert message contains https:// and runtimes.python.feed-url
src/runtimes/python/extension.rs	test_validate_version_injection_rejected	Rewritten	bare is_err() → unwrap_err() + assert message contains ADO expression and runtimes.python.version
src/runtimes/dotnet/extension.rs	test_validate_invalid_feed_url_rejected	Rewritten	bare is_err() → unwrap_err() + assert message contains ADO expression and runtimes.dotnet.feed-url
src/runtimes/dotnet/extension.rs	test_validate_version_injection_rejected	Rewritten	bare is_err() → unwrap_err() + assert message contains ADO expression and runtimes.dotnet.version

Verification

• cargo test: all tests pass ✅
• No regressions introduced ✅

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