RUMM-1803 Stop reporting pre-warmed application launch time

[maxep]

What and why?

Don't report launch time for pre-warmed process.

RFC 2353430547

How?

// isActivePrewarm = [NSProcessInfo.processInfo.environment[@"ActivePrewarm"] isEqualToString:@"1"];

BOOL __dd_private_isActivePrewarm() {
    if (isActivePrewarm) return isActivePrewarm;
    CFTimeInterval time = __dd_private_AppLaunchTime();
    return time > ValidAppLaunchTimeThreshold;
}

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)
• Make sure each commit and the PR mention the Issue number or JIRA reference
• Add CHANGELOG entry for user facing change.