Language service OOM on lodash DT tests when batch compilation succeeds

[andrewbranch]

Various CI runs on lodash for DefinitelyTyped confirm that batch compilation works fine, but certain language service operations OOM consistently, and the PR doesn’t look particularly costly. This makes me wonder if the language service is doing more work than necessary.

DefinitelyTyped/DefinitelyTyped#36288

Benchmarking logs tell us exactly where the OOM happened, so we should be able to repro in VS Code by checking out refs/pull/36288/merge and requesting quick info and/or completions at one of the problem locations: https://dev.azure.com/definitelytyped/DefinitelyTyped/_build/results?buildId=6947