[dds/dap] Fix an issue with DAP Source.name being file paths when package: and dart: URIs are expected The move to URIs introduced a subtle bug here - we would use the mapped URI (which is almost always `file:`) to decide whether to show a file path, instead of doing it only if the unmapped URI was a `file` (eg. it could have been `package:` or `dart:`. This wasn't caught by any tests here, but was caught in the Flutter roll (https://github.com/flutter/flutter/pull/145235). This fixes it and adds a new test that we verify the Source names for local files, packages, and dart: URIs. Change-Id: I282bf935b9fa4016abeafd556dfd368950ee9611 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/357325 Commit-Queue: Helin Shiah <helinx@google.com> Reviewed-by: Ben Konyi <bkonyi@google.com> Reviewed-by: Helin Shiah <helinx@google.com>
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