[25.2] Final backports and changes for 25.2rc1

[achow101]

Backport:

• wallet: Fix use-after-free in WalletBatch::EraseRecords #29176
• util: Allow std::byte and char Span serialization #27927

#29176 does not cleanly backport, and it also requires 27927 to work. Both are still fairly simple backports.

Also does the rest of the version bump tasks for 25.2rc1.

[DrahtBot]

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[DrahtBot]

🚧 At least one of the CI tasks failed. Make sure to run all tests locally, according to the
documentation.

Possibly this is due to a silent merge conflict (the changes in this pull request being
incompatible with the current code in the target branch). If so, make sure to rebase on the latest
commit of the target branch.

Leave a comment here, if you need help tracking down a confusing failure.

_{Debug: https://github.com/bitcoin/bitcoin/runs/21841217972}

[maflcko]

lgtm

[fanquake]

ACK 9f13dc1