metricstarttimeprocessor: add reset detection to the start_time_metric strategy

[ridwanmsharif]

Component(s)

processor/metricstarttime

What happened?

After #38381 is addressed, we need to add reset detection in the start time metric strategy as well.

opentelemetry-collector-contrib/processor/metricstarttimeprocessor/internal/starttimemetric/adjuster.go

Line 104 in 8f61805

// TODO: handle resets by factoring reset handling out of other strategies

Collector version

latest

Environment information

No response

OpenTelemetry Collector configuration

Log output

Additional context

No response

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[github-actions]

Pinging code owners:

• processor/metricstarttime: @dashpole @ridwanmsharif

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