fix(core-blockchain): AcceptBlockHandler apply block to tx pool before db

[air1one]

Summary

AcceptBlockHandler apply block to tx pool before db.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #3590 into 2.6 will decrease coverage by 0.04%.
The diff coverage is 48.14%.

@@            Coverage Diff             @@
##              2.6    #3590      +/-   ##
==========================================
- Coverage   66.12%   66.07%   -0.05%     
==========================================
  Files         440      441       +1     
  Lines       12481    12504      +23     
  Branches     1714     1717       +3     
==========================================
+ Hits         8253     8262       +9     
- Misses       4194     4208      +14     
  Partials       34       34

Impacted Files	Coverage Δ
packages/core-transaction-pool/src/connection.ts	91.32% <0%> (-0.38%)	⬇️
...s/core-jest-matchers/src/functional/unconfirmed.ts	0% <0%> (ø)
...ain/src/processor/handlers/accept-block-handler.ts	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 03976a6...1a374b0. Read the comment docs.