Use system time as started time

[Pharaohsk]

What was changed

Use system time as started time

Why?

Have implicit activity context timeout start-to-close be relative to system time not server time

Checklist

1. Closes
   Have implicit activity context timeout start-to-close be relative to system time not server time #1930

2. How was this tested:

The time is not consistent across hosts in the construct cluster.
The local time of the host on which the construct executes the activity has exceeded the timeout set by the server.
#1912

3. Any docs updates needed?

N/A

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[cretz]

I am not sure backwards-incompatibly changing the activity start time to no longer be the server-reported start time is the correct answer to #1930. #1930 refers to the timeout calculation which can be done with system time. People may expect the activity info's StartedTime to match exactly what the server reports for the activity and this would break that expectation. The time the activity started is actually owned by the server and is not the same as the time the activity reached the worker.

[Pharaohsk]

我不确定将活动开始时间向后不兼容地更改为不再使用服务器报告的开始时间是否是#1930的正确答案。#1930指的是可以使用系统时间进行的超时计算。人们可能期望活动信息与StartedTime服务器报告的活动信息完全匹配，但这会打破这种期望。活动开始的时间实际上归服务器所有，并且与活动到达工作器的时间不同。

thanks for your reminder. I have modified it

[cretz]

I don't think we should change this variable, just leave it as it was and adjust calculateActivityDeadline to no longer accept a started time and just use time.Now() within it. It's effectively the same thing, but I think it's clearer not change anything in this function (except it'll be one less parameter to calculateActivityDeadline).

[Pharaohsk]

thanks for your review. I have modified it
Use time.Now as started in calculateActivityDeadline

[cretz]

This looks good to me, @Quinn-With-Two-Ns?