log: improve some validation log messages to include hashPrevBlock
log: improve some validation log messages to include hashPrevBlock

Summary:
Backport of [[https://github.com/bitcoin/bitcoin/pull/26487 | core#26487]]

When there is an issue with a previous block the current log messages do
not indicate hashPrevBlock. Adding it makes debugging easier.

Test Plan:
  ninja check check-functional

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D12538

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