fix: Scope ExecSessionManager to Session instead of using global singleton #2664
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The
SessionManager
inexec_command
owns a number ofExecCommandSession
objects whereExecCommandSession
has a non-trivial implementation ofDrop
, so we want to be able to drop an individualSessionManager
to help ensure things get cleaned up in a timely fashion. To that end, we should have oneSessionManager
per session rather than one global one for the lifetime of the CLI process.