refactor: delete extra ctors from managers, restore memory-only db for EvoDb and LLMQContext

[kwvg]

Additional Information

• Dependency for backport: merge bitcoin#24595 (move g_versionbitscache global to ChainstateManager) #6933

• There is a mild performance improvement when restoring memory-only databases in unit tests

  Build arguments:

  CC=clang CXX=clang++ ./configure --prefix=$(pwd)/depends/arm64-apple-darwin25 --enable-werror --enable-debug --enable-crash-hooks --enable-stacktraces --enable-zmq --enable-suppress-external-warnings --disable-ccache --disable-hardening

  develop (b82450a):

  $ ttime ./src/test/test_dash
  Running 676 test cases...
  
  *** No errors detected
  
  real:    100.50s
  user:    61.92s
  system:  12.90s
  memory:  399920KB
  

  This PR (969e2c45932437e9d5da21dc833cc33ea103d295):

  $ ttime ./src/test/test_dash # PR
  Running 676 test cases...
  
  *** No errors detected
  
  real:    75.06s
  user:    58.18s
  system:  10.03s
  memory:  394896KB
  

Breaking Changes

None expected.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas (note: N/A)
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation (note: N/A)
• I have assigned this pull request to a milestone (for repository code-owners and collaborators only)