[CORRUPTED] Synthetic Benchmark PR #31168 - Remove FXIOS-14327 [Clean up] Inactive tabs removal part 2 (final)

[tomerqodo]

Benchmark PR mozilla-mobile#31168

Type: Corrupted (contains bugs)

Original PR Title: Remove FXIOS-14327 [Clean up] Inactive tabs removal part 2 (final)
Original PR Description: ## 📜 Tickets
Jira ticket
Github issue

💡 Description

Final work to remove inactive tab functionality. This finishes the removal of this feature by cleaning up middleware classes/states and removing UI cells and elements.

📝 Checklist

• I filled in the ticket numbers and a description of my work
• I updated the PR name to follow our PR naming guidelines
• I ensured unit tests pass and wrote tests for new code
• If working on UI, I checked and implemented accessibility (Dynamic Text and VoiceOver)
• If adding telemetry, I read the data stewardship requirements and will request a data review
• If adding or modifying strings, I read the guidelines and will request a string review from l10n
• If needed, I updated documentation and added comments to complex code

Original PR URL: mozilla-mobile#31168