fix(ingest): cancel command exits 0 on success (#225)

cancel_import was unconditionally calling std::process::exit(1),
making a successful cancel indistinguishable from a failure. Exit code
1 is reserved for terminal-failure statuses (failed, cancelled) in
status / poll_ingest — the cancel command itself succeeded.

Co-authored-by: Eddie A Tejeda <669988+eddietejeda@users.noreply.github.com>

Author: eddietejeda

src/commands/ingest.rs

@@ -1070,7 +1070,6 @@ fn cancel_import(workspace_id: &str, output: &str, id: &str) {
             .dark_grey()
         );
     });
-    std::process::exit(1);
 }
 
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