Code lens crash in test

[lukaszsamson]

GenServer ElixirLS.LanguageServer.Server terminating\n** (MatchError) no match of right hand side value: nil\n    (elixir 1.13.4) lib/kernel/parallel_compiler.ex:705: anonymous fn/3 in Kernel.ParallelCompiler.handle_deadlock/2\n    (elixir 1.13.4) lib/enum.ex:2396: Enum.\"-reduce/3-lists^foldl/2-0-\"/3\n    (elixir 1.13.4) lib/kernel/parallel_compiler.ex:701: Kernel.ParallelCompiler.handle_deadlock/2\n    (elixir 1.13.4) lib/kernel/parallel_compiler.ex:433: Kernel.ParallelCompiler.spawn_workers/7\n    (elixir 1.13.4) lib/kernel/parallel_compiler.ex:204: Kernel.ParallelCompiler.spawn_workers/5\n    (elixir 1.13.4) lib/kernel/parallel_compiler.ex:177: Kernel.ParallelCompiler.spawn_workers/3\n    (language_server 0.11.0) lib/language_server/build.ex:92: ElixirLS.LanguageServer.Build.reload_project/0\n    (language_server 0.11.0) lib/language_server/server.ex:1318: ElixirLS.LanguageServer.Server.maybe_rebuild/1\n    (language_server 0.11.0) lib/language_server/server.ex:1130: ElixirLS.LanguageServer.Server.set_settings/2\n    (language_server 0.11.0) lib/language_server/server.ex:187: ElixirLS.LanguageServer.Server.handle_cast/2\n    (stdlib 4.1.1) gen_server.erl:1123: :gen_server.try_dispatch/4\n    (stdlib 4.1.1) gen_server.erl:1200: :gen_server.handle_msg/6\n    (stdlib 4.1.1) proc_lib.erl:240: :proc_lib.init_p_do_apply/3

Reported upstream elixir-lang/elixir#12228
Fixed on elixir master, the fix will not be backported to 1.14

The problem is that we are building 2 times in short succession and that triggers race conditions in the compiler