[PM-14999] Remove Sequentialize

[justindbaur]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-14999

📔 Objective

Sequentialize was used to give back a cached unfulfilled promise back to later callers. But we've come a long way since this was added and you know what's even better? Not calling this method to many times in a short period of time.

📸 Screenshots

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.45%. Comparing base (2ee14ba) to head (e249152).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12113      +/-   ##
==========================================
- Coverage   33.46%   33.45%   -0.02%     
==========================================
  Files        2874     2873       -1     
  Lines       89843    89779      -64     
  Branches    17106    17099       -7     
==========================================
- Hits        30068    30036      -32     
+ Misses      57399    57368      -31     
+ Partials     2376     2375       -1     

☔ View full report in Codecov by Sentry.
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