[30.x] 30.3rc1

[fanquake]

Final changes for v30.3rc1.

Backports since 30.2:

• [30.x] More backports #34283
• [30.x] Backports #34459
• [30.x] Backports #34689
• [30.x] Partial backport #34650 #34754
• [30.x] Backports #34805
• [30.x] Backports #34856
• [30.x] validation: correct lifetime of precomputed tx data #35211
• [30.x] Backports #35232

[DrahtBot]

The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/35452.

Reviews

See the guideline for information on the review process.
A summary of reviews will appear here.

[andrewtoth]

Can we have something like this in the release notes. Also for 29 point release (and possibly 31 if we don't have an automatic compaction patch merged):

This fixes an issue where the chainstate database would repeatedly rewrite
large portions of itself, causing excessive disk reads and writes during
normal operation.

As a side effect, the chainstate will be around 4 GB larger after an initial
sync. To reclaim this space, restart the node with -forcecompactdb=1
after the initial sync has finished. It should be removed on subsequent
restarts. Leaving it set will cause significant disk reads and writes every
time the node is restarted.