refactor: Remove unused includes from dbwrapper.h #25645

Unused includes are confusing, but also cause unrelated compile errors when the unused includes were to be removed.

Fix that by adding the missing includes where they are needed and then remove them where they are not needed. This is also checked by iwyu.

Concept ACK.

ACK if green tidy. Could also include

rpc/fees.cpp should remove these lines:
- #include <policy/policy.h>  // lines 9-9
- #include <util/system.h>  // lines 19-19

ACK faf98aecf876fae0ec6d4d16b7e66f3a35253180, I have reviewed the code and it looks OK, I agree it can be merged.

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Conflicts

Reviewers, this pull request conflicts with the following ones:

• #25623 ([kernel 3e/n] Decouple CDBWrapper and CBlockTreeDB from ArgsManager by dongcarl)
• #25527 ([kernel 3c/n] Decouple validation cache initialization from ArgsManager by dongcarl)
• #25172 (refactor: use std:: prefix for std lib funcs by fanquake)
• #24833 (refactor: consensus/tx_verify.{h,cpp} tidy-ups by jonatack)
• #24232 (assumeutxo: add init and completion logic by jamesob)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

It indeed does look a bit confusing. But I can still build from scratch on macOS 12.4

Code Review ACK https://github.com/bitcoin/bitcoin/commit/faf98aecf876fae0ec6d4d16b7e66f3a35253180

CI is green, compiled on ubuntu 22.04 and macOS 12.4 without issue, also ran tests.