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### What does this PR do? The DevSever's `IncrementalGraph` uses a data-oriented design memory management style, storing data in lists and using indices instead of pointers. In conventional memory management, when we free a pointer and accidentally use it will trip up asan. Obviously this doesn't apply when using lists and indices, so this PR adds a check in debug & asan builds. Everytime we free an `Edge` we better make sure that there are no more dangling references to that spot. This caught a case where we weren't setting `g.first_import[file_index] = .none` when deleting a file's imports, causing a dangling reference and out of bounds access. --------- Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>