Janitorial: drop support for PHP 7.0 and 7.1

[jeherve]

https://make.wordpress.org/core/2024/04/08/dropping-support-for-php-7-1/

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1. Added PHP 7.0 testing in WordPress previous. #38356
   Actions [Package] Jetpack mu wpcom [Plugin] Jetpack [Tests] Includes Tests +4
2. General: Bump minimum PHP version to 7.2 #40147
   Actions Docs [Feature] Calypsoify [Feature] Contact Form [Feature] Google Analytics [Feature] Masterbar [Feature] Photon [Feature] Theme Tools [Feature] WPCOM API [Feature] WooCommerce Analytics [Package] A8c Mc Stats [Package] Ad [Package] Admin Ui [Package] Analyzer [Package] Assets [Package] Autoloader [Package] Backup [Package] Backup Helper Script Manager [Package] Blaze [Package] Blocks [Package] Boost Core [Package] Boost Speed Score [Package] Calypsoify [Package] Changelogger [Package] Chatbot [Package] Classic Theme Helper [Package] Codesniffer [Package] Compat [Package] Composer Plugin [Package] Config [Package] Connection [Package] Constants [Package] Device Detection [Package] Error [Package] Explat [Package] Forms [Package] Google Analytics [Package] IP [Package] Ignorefile [Package] Image CDN [Package] Import [Package] Jetpack mu wpcom [Package] Jitm [Package] Licensing [Package] Logo [Package] Masterbar [Package] My Jetpack [Package] Password Checker [Package] Patchwork Redefine Exit [Package] Phpcs Filter [Package] Plans [Package] Plugin Deactivation [Package] Plugins Installer [Package] Post List [Package] Protect Models [Package] Protect Status [Package] Publicize [Package] Redirect [Package] Roles [Package] Scheduled Updates [Package] Schema [Package] Search [Package] Stats Admin [Package] Stats Data [Package] Status [Package] Sync [Package] Transport Helper [Package] VideoPress [Package] WAF [Package] WP JS Data Sync [Package] WooCommerce Analytics [Package] Yoast Promo [Plugin] Automattic For Agencies Client [Plugin] Backup [Plugin] Beta [Plugin] Boost [Plugin] CRM [Plugin] Classic Theme Helper Plugin [Plugin] Inspect [Plugin] Jetpack [Plugin] Migration [Plugin] Protect [Plugin] Search [Plugin] Social [Plugin] Starter Plugin [Plugin] Super Cache [Plugin] VaultPress [Plugin] VideoPress [Plugin] Wpcomsh [Plugin] mu wpcom [Tests] Includes Tests [Tools] Development CLI [Type] Janitorial [mu wpcom Feature] Starter Page Templates +94
   
3. Remove CI checks for PHP 7.0-
4. Revert changes to .github/files/phpcompatibility-dev-phpcs.xml (see CI: Disable 8.4 PHPCompatibility rule in dev run #36673)
5. Address warnings such as PHP8.4 alpha 1 warnings - nullable is deprecated, the explicit nullable type must be used instead #38226
6. Codesniffer: remove PHP 7.0 and 7.1 support #40174
   Docs [Package] Codesniffer [Tests] Includes Tests +3
   
7. Janitorial: Disparate cleanup tasks #40200
   Actions [Feature] Masterbar [Package] Assets [Package] Autoloader [Package] Changelogger [Package] Jetpack mu wpcom [Package] Masterbar [Package] Status [Plugin] Beta [Plugin] CRM [Plugin] Jetpack [Plugin] Super Cache [Plugin] VaultPress [Plugin] Wpcomsh [Tests] Includes Tests [Tools] Development CLI [mu wpcom Feature] Custom Css [mu wpcom Feature] Replace Site Visibility [mu wpcom Feature] Wpcom Blocks +19
   

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Epic: #36721

[jeherve]

@tbradsha I see you've started working on this in #40147; Thank you! I've consequently assigned this issue to you.