remove deprecated UDP TPU socket bindings

[AvhiMaz]

Problem

The validator binds an excessive number of network ports. UDP TPU path (transaction ingress via UDP) is deprecated since
version 3.0 and no longer used - the system now exclusively uses QUIC for TPU transaction ingress. Removing these unused socket bindings reduces resource consumption and simplifies network configuration.

Summary of Changes

Removes deprecated UDP socket bindings for TPU and TPU forwards paths that are no longer in use:

• Removed tpu_port and tpu_sockets UDP socket binding code from Node::new_with_client()
• Removed tpu_forwards_port and tpu_forwards_sockets UDP socket binding code
• Removed tpu: Vec<UdpSocket> and tpu_forwards: Vec<UdpSocket> fields from Sockets struct
• Updated test_tpu_forwards_quic_uses_correct_port test to only verify QUIC paths (UDP variant no longer exists)
• Updated CLUSTER_INFO_TRACE_LENGTH constant to reflect the changes in ContactInfo trace output
• Removed test helper reference to non-existent sockets.tpu field

Fixes #7525 (partially)

[AvhiMaz]

hi @alexpyattaev sir

the tests are failing here because this PR depends on the changes in #9299
(removal of tpu_enable_udp configuration). the socket removal in this pr
requires the configuration cleanup to pass tests.

should i merge the changes from #9299 into this branch, or would you prefer
a different approach?

happy to adjust based on what's easiest for review. thanks!

[alexpyattaev]

should i merge the changes from #9299 into this branch, or would you prefer a different approach?

This is fine, but in such cases it is best to keep such PRs as drafts and mention that it goes on top of something else to avoid confusion.

For example:

• You have commits A and B that need to go in order, but you want them to be reviewed in separate PRs
• Put A into PR_A, mark ready for review.
• Put A->B chain into PR_B, mark as draft and link back to PR_A.
• Once PR_A is approved and merged, you can rebase the branch which feeds PR_B, which will remove commit A from it, and then you can mark PR_B as ready for review.

Thank you!

[alexpyattaev]

I think you did it backwards:)

[AvhiMaz]

I think you did it backwards:)

Got it! I've now marked this PR as draft since it depends on #9299.

Once #9299 is merged, I'll rebase this branch to remove the duplicate
commits and mark it ready for review. Thanks for the clarification!

[mergify]

If this PR represents a change to the public RPC API:

1. Make sure it includes a complementary update to rpc-client/ (example)
2. Open a follow-up PR to update the JavaScript client @solana/kit (example)

Thank you for keeping the RPC clients in sync with the server API @AvhiMaz.

[alexpyattaev]

Important: some functions that used to return TPU UDP address/port should generally not start returning TPU QUIC address/port. This may cause confusion and bugs. Also in many cases we already have a quic-specific getter.

[alexpyattaev]

This looks good, but now that tvu quic was removed the conflicts must be resolved and it should be good to go.

[alexpyattaev]

A couple more instances to remove and we should be good to go!

[alexpyattaev]

The diff LGTM (except for the added typo), please squash all commits into one with a clean message, thank you!

[alexpyattaev]

Probably need to rebase to get CI to clear - error has nothing to do with this PR. Diff looks good.

[alexpyattaev]

LGTM

CI red due to incorrect const update in gossip unittests

[alexpyattaev]

@gregcusack ended up editing this to wrap it up before 4.0 is cut.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.5%. Comparing base (eaf1e04) to head (0300eb4).
⚠️ Report is 76 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #9291     +/-   ##
=========================================
- Coverage    82.5%    82.5%   -0.1%     
=========================================
  Files         844      844             
  Lines      316364   316322     -42     
=========================================
- Hits       261207   261172     -35     
+ Misses      55157    55150      -7     

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