fix(shred-network): reliability

[Sobeston]

PR includes:

• more efficient spawning of repair jobs + a lower max thread count to avoid blowing out the sender channel
• usage of sendmmsg for sending batches of udp packets for faster repair
• additional tracy instrumentation for:
  • various zones related to shred network
  • naming and plotting every channel used in the validator (for finding indefinitely growing channels)
  • plots for some packet counts
• some small fixes

The full validator is now able to catch up to testnet using shred-network

[codecov]

Codecov Report

❌ Patch coverage is 86.36364% with 24 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/net/socket_utils.zig	82.81%	11 Missing ⚠️
src/ledger/shred_inserter/shred_inserter.zig	86.20%	8 Missing ⚠️
src/shred_network/shred_receiver.zig	57.14%	3 Missing ⚠️
src/gossip/data.zig	0.00%	1 Missing ⚠️
src/gossip/service.zig	95.65%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/accountsdb/snapshot/data.zig	90.64% <100.00%> (ø)
src/gossip/ping_pong.zig	98.26% <100.00%> (+0.03%)	⬆️
src/ledger/shred_inserter/slot_chaining.zig	92.10% <100.00%> (+0.21%)	⬆️
src/ledger/shred_inserter/working_state.zig	88.77% <100.00%> (+0.11%)	⬆️
src/replay/exec_async.zig	94.80% <100.00%> (ø)
src/shred_network/repair_service.zig	83.01% <100.00%> (+0.05%)	⬆️
src/shred_network/service.zig	92.00% <100.00%> (+0.19%)	⬆️
src/shred_network/shred_processor.zig	92.18% <100.00%> (+0.25%)	⬆️
src/sync/channel.zig	96.19% <100.00%> (+0.36%)	⬆️
src/utils/lru.zig	96.34% <100.00%> (+0.02%)	⬆️
... and 5 more

... and 4 files with indirect coverage changes

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