Release v7.0.0-beta.clean

[michaelsproul]

Plan for release v7.0.0-beta.clean:

Merge cleaned up versions of the necessary changes from holesky-rescue into release-v7.0.0. This will make it easier to reconcile the release with unstable in future.

TODO:

• Backport Manual finalization endpoint #7059. Impl is already clean IMO, so we can likely just cherry-pick this commit. @eserilev: Pseudo finalization endpoint #7103
• Backport Manual compaction endpoint #7072. As above. @eserilev.
• Backport Prevent writing to state cache when migrating the database #7067. @eserilev / @michaelsproul: State cache tweaks #7095.
• Backport fork choice/blocks by range changes from Load block roots from fork choice where possible when serving BlocksByRange requests #7058 and Split block root lookups between fork choice and store on BBR response #7066. These are combined into one PR by @dapplion: Compute roots for unfinalized by_range requests with fork-choice #7098.
• Backport Optimise status processing on release-v.7.0.0-beta.2 (TESTING branch) #7054. @michaelsproul. New PR: Optimise status processing #7082.
• Backport Change state cache size default to 32 #7055. @jimmygchen. New PR: Change state cache size default to 32 #7101
• Backport lighthouse/add_peer Add http endpoint to add trusted peer #7068. @pawanjay176. New PR: Admin add/remove peer #7198
• Backport Add CI fixes to holesky-rescue #7071. This one is a bit tricky as the CI fixes are relevant across a few different PRs. Pseudo finalization endpoint #7103

Done previously:

• Add CLI flag for additional block bans, but keep default ban: Add block ban flag --invalid-block-roots #7042
• Specialise default block ban for Holesky: Add block ban flag --invalid-block-roots #7042
• Remove 2 + 2 == 5 hacks: Use sync_tolerance_epochs flag to control the proposer prep routines #7044
• Cherry pick --disable-attesting changes for the VC into a clean PR: Add --disable-attesting flag to validator client #7046
• Add a flag for lengthening the VC timeouts used by --use-long-timeouts (we hardcoded 25x in holesky-rescue): https://github.com/sigp/lighthouse/pull/7041/files#r1971104870. @macladson
• Implement short-term memory optimisations described here: Lighthouse OOM mitigations #7053.

[michaelsproul]

We can PR changes to the (now misleadingly named) disable-attesting branch

[eserilev]

for all the block ban related changes (cli flag, default block ban for holesky)
michaelsproul#8

[eserilev]

remove fork choince endpoint
michaelsproul#9

[paulhauner]

We've changed course and will be releasing v7.0.0-beta.1 as a Holesky hot-fix: #7041

See #7040 for more Holesky recovery info.

[michaelsproul]

I think for the "cleaner" release we can use the same sync-threshold flag to control the proposer prep routines. Rather than a new flag or the current always-true approach

[macladson]

CLI flag to control long timeouts: #7047