Improve speed of AES KDF transform

[droidmonkey]

• Remove parallel left/right block calculations in favor of calculating both blocks simultaneously. This brings the calculation within parity of 2.6.6.
• Fix After Update, it's taking 3x as long to decrypt database. #7682

Testing strategy

Tested develop branch against 2.6.6 and noticed appreciable difference when KDF set to 5 seconds. 2.6.6 is roughly twice as fast.
Tested this branch against 2.6.6 and the difference is eliminated.

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.28%. Comparing base (aca197a) to head (674e8ad).
Report is 461 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7755      +/-   ##
===========================================
- Coverage    64.31%   64.28%   -0.03%     
===========================================
  Files          339      339              
  Lines        43450    43439      -11     
===========================================
- Hits         27943    27924      -19     
- Misses       15507    15515       +8     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles