refactor(sync): combine server channels

[eitanm-starkware]

This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 70.70707% with 29 lines in your changes missing coverage. Please review.

Project coverage is 66.41%. Comparing base (3bcfcc6) to head (2e2ec9f).

Files	Patch %	Lines
crates/papyrus_node/src/main.rs	0.00%	18 Missing ⚠️
crates/papyrus_p2p_sync/src/client/mod.rs	0.00%	7 Missing ⚠️
crates/papyrus_p2p_sync/src/client/header.rs	50.00%	2 Missing ⚠️
...papyrus_network/src/peer_manager/behaviour_impl.rs	0.00%	1 Missing ⚠️
crates/papyrus_p2p_sync/src/server/mod.rs	97.43%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2247      +/-   ##
==========================================
+ Coverage   66.34%   66.41%   +0.06%     
==========================================
  Files         139      139              
  Lines       18379    18371       -8     
  Branches    18379    18371       -8     
==========================================
+ Hits        12194    12201       +7     
+ Misses       4890     4875      -15     
  Partials     1295     1295              

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[ShahakShama]

Reviewed 10 of 11 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @eitanm-starkware)

---

crates/papyrus_network/src/network_manager/test.rs line 295 at r2 (raw file):

    select! {
        _ = async move {
            let SqmrServerPayload{query: query_got, report_sender: _report_sender, mut responses_sender} = inbound_payload_receiver.next().await.unwrap();

Space before {
I'm surprised CI didn't complain

---

crates/papyrus_p2p_sync/src/client/mod.rs line 114 at r2 (raw file):

#[derive(thiserror::Error, Debug)]
pub enum P2PClientSyncError {

Rename to P2PSyncClientError

[ShahakShama]

Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @eitanm-starkware)

[eitanm-starkware]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @ShahakShama)

---

crates/papyrus_network/src/network_manager/test.rs line 295 at r2 (raw file):

Previously, ShahakShama wrote…

Space before {
I'm surprised CI didn't complain

there is a space though