telemetry(amazonq): deprecate codewhisperer_userDecision metric

[tomcat323]

Problem

the codewhisperer_userDecision metric isn't used by the codewhisperer/Q team. And it is very noisy (5x more emits than second most frequent metric, 20x more emits than the third).

Solution

Stop emitting this metric from vsCode

Note

The user decision events are still kept since they are used to calculate userTriggerDecision. De-noising it would be the next TODO

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[justinmk3]

The user decision events are still kept since they are used to calculate userTriggerDecision

? What does this mean? Can you point to a code example