Change Details

``` It is unclear from the name that GetTimeMicros returns the system time. Also, it is not using the type-safe std::chrono types. Fix both issues by replacing it with SystemClock in the only place it is used. This refactor should not change behavior. ``` Backport of core#27233. Depends on D18873.

``` It is unclear from the name that GetTimeMicros returns the system time. Also, it is not using the type-safe std::chrono types. Fix both issues by replacing it with SystemClock in the only place it is used. This refactor should not change behavior. ``` Backport of [[https://github.com/bitcoin/bitcoin/pull/27233 | core#27233]]. Depends on D18873.

``` It is unclear from the name that GetTimeMicros returns the system time. Also, it is not using the type-safe std::chrono types. Fix both issues by replacing it with SystemClock in the only place it is used. This refactor should not change behavior. ``` Backport of [[https://github.com/bitcoin/bitcoin/pull/27233 | core#27233]]. Depends on D18873.