And move headers direct fetch to end of ProcessHeadersMessage
Review tip:
`git show --color-moved=dimmed-zebra --color-moved-ws=ignore-all-space`
This should show only linter changes due to reduced indentation in the moved code block.
This is a partial backport of core#25454
https://github.com/bitcoin/bitcoin/pull/25454/commits/29c45185223441943ab610e62937a118c7c3a5b2
https://github.com/bitcoin/bitcoin/pull/25454/commits/2b341db731793844f12944363186edea23eabdeb
Depends on D14908