Bootstrap/Load Changes in 5.8

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WordPress 5.8 brings some small changes to the Boostrap/Load component.

timer_float is a new function that can be used to reliably determine the total time from the start of php execution. See #39163
Inline comments were updated to make it clearer in wp-config-sample.php where custom configuration variables should go and wp-load.php to help improve the understanding of error level reporting. See #37199 and #41902
Fatal error recovery was updated to not say an email was sent when it was impossible to send the email. See #52560
enable_loading_object_cache_dropin is a new filterFilter Filters are one of the two types of Hooks https://codex.wordpress.org/Plugin_API/Hooks. They provide a way for functions to modify data of other functions. They are the counterpart to Actions. Unlike Actions, filters are meant to work in an isolated manner, and should never have side effects such as affecting global variables and output. to allow disabling of the object cache dropin. See #53322

Thank you to all of the people who contributed to the Bootstrap/Load component in 5.8.

Props to @desrosj for review and edits.

#5-8, #bootstrap-load, #dev-notes

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