Remove redundant lock annotations in net processing

Summary:
This is a backport of core#21188

Bitcoin ABC has one additional occurence of duplicated lock annotations (D9044 for ProcessOrphanTx) and two occurences that were already deduplicated (D11435 for TipMayBeStale and D11437 for MaybeSetPeerAsAnnouncingHeaderAndIDs).

Test Plan:
With clang:

ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D11443