terminate "tidevice perf" using SIGTERM instead of SIGINT

When I send a SIGINT signal using the process ID after executing the 'tidevice perf' command, it doesn't work for some reason. Does the clean-up operation after executing the 'tidevice perf' command work correctly if I terminate it using the SIGTERM signal instead of SIGINT?

When tidevice receive SIGTERM, i want to terminate tidevice process gracefully.

Start by reproducing the termination behavior through the `tidevice perf` entry point, comparing SIGINT and SIGTERM. Trace the existing cleanup path and verify that sending SIGTERM ends the process gracefully and performs the same cleanup as intended.

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