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See https://github.com/docker/cli/pull/4599 and https://github.com/docker/cli/pull/4769. Since we switched to using the cobra command context instead of `appcontext`, we need to set up the signal handling that was being provided by `appcontext`, as well as configuring the context with the OTEL tracing utilities also used by `appcontext`. This commit introduces `cobrautil.ConfigureContext` which implements the pre-existing signal handling logic from `appcontext` and cancels the command's context when a signal is received, as well as doing the relevant OTEL config. Signed-off-by: Laura Brehm <laurabrehm@hey.com>