[Focus Mode] New content and images for the Network request blocking tool

[captainbrosset]

New images and content for the Network request blocking tool article.
I also removed the last section, because it was essentially a repeat of the first section.

Before: https://learn.microsoft.com/en-us/microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool
After: https://review.learn.microsoft.com/en-us/microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool?branch=pr-en-us-2890

AB#47204968

[mikehoffms]

Writer/Editor review pass

[learn-build-service-prod]

Learn Build status updates of commit fe0f8b4:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool.md	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool-images/blocked-images.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool-images/block-network-request.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool-images/block-request-from-network-tool.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool-images/edit-blocked-request.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool-images/more-tabs-icon-light-theme.png	✅Succeeded	n/a (file deleted or renamed)
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool-images/network-request-blocking-tool.png	✅Succeeded	n/a (file deleted or renamed)
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool-images/network-request-blocking-tool-not-blocked.png	✅Succeeded	n/a (file deleted or renamed)
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool-images/network-request-blocking-tool-remove-all-patterns-icon.png	✅Succeeded	n/a (file deleted or renamed)
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool-images/remove-blocked-request.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/network-request-blocking/network-request-blocking-tool-images/toggle-request-blocking.png	✅Succeeded	View

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[mikehoffms]

Writer/Editor final review