Replace REQUEST_TIME in services

Problem/Motivation

core/lib/Drupal/Core/Asset/CssCollectionOptimizer.php
core/lib/Drupal/Core/Asset/JsCollectionOptimizer.php
core/lib/Drupal/Core/Asset/JsCollectionRenderer.php
core/lib/Drupal/Core/Batch/BatchStorage.php
core/lib/Drupal/Core/Cache/ApcuBackend.php
core/lib/Drupal/Core/Cache/DatabaseBackend.php
core/lib/Drupal/Core/Cache/MemoryBackend.php
core/lib/Drupal/Core/Cache/PhpBackend.php
core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
core/lib/Drupal/Core/Flood/DatabaseBackend.php
core/lib/Drupal/Core/Flood/MemoryBackend.php
core/lib/Drupal/Core/Path/AliasManager.php
core/lib/Drupal/Core/KeyValueStore/KeyValueDatabaseExpirableFactory.php
core/lib/Drupal/Core/Session/SessionHandler.php
core/lib/Drupal/Core/Session/SessionManager.php
core/modules/user/src/EventSubscriber/UserRequestSubscriber.php
core/modules/search/src/SearchIndex.php
core/modules/comment/src/CommentStatistics.php
core/modules/update/src/UpdateProcessor.php

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet