Change Details

``` As usual: Switch to std::chrono time to be type-safe and mockable Add basic test that relies on mocktime to add code coverage ``` Backport of core PR18454.

``` As usual: Switch to std::chrono time to be type-safe and mockable Add basic test that relies on mocktime to add code coverage ``` Backport of core [[https://github.com/bitcoin/bitcoin/pull/18454 | PR18454]].

``` As usual: Switch to std::chrono time to be type-safe and mockable Add basic test that relies on mocktime to add code coverage ``` Backport of core [[https://github.com/bitcoin/bitcoin/pull/18454 | PR18454]].