Upgrade local Geth version to PoS

[badgersrus]

Why this change is needed

EIP-4844 support

What changes were made as part of this PR

• Upgrade geth version to 1.14.6
• Upgrade prysm version to 5.0.4
• Move to a new script based network generation
• Add clunky build number sequence due to issues with the geth.ipc path when running on github, unix char limit (parallelisation of tests mean you need each one in its on directory for the beacon chain to execute against)
• Move to singular geth/ beacon nodes. Can run multiple validator clients easily
• Increased PR build timeout to 10m for the full sim test which takes ~ 9mins now
• Refactored all instances of Obscuro to Ten in files I came across (sorry, but needs doing eventually!)

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Name	Status	Preview	Comments	Updated (UTC)
bridge	❌ Failed (Inspect)			Jun 5, 2024 4:19pm

[tudor-malene]

LGTM , if it works (including local testnet)

I left a few minor comments.
Also, we should try to keep big refactoring (renaming) PRs separate from functionality PRs, as it makes it a bit harder to review.

[tudor-malene]

this function could use a comment

[tudor-malene]

lgtm ( once the "local tests" are confirmed)