fix(l2): use dummy peer handler

[avilagaston9]

Motivation

In #5004 , the PeerHandler was modified to receive the Initiator GenServer handle. As a result, our L2 initializer was updated to spawn the Initiator GenServer, which led to the following log being repeatedly printed in our L2 node:

2025-11-06T14:57:09.120191Z  INFO ethrex_p2p::discv4::peer_table: Resetting list of tried peers.

Description

• Since we don't have P2P in L2, this PR updates the L2 initializer to use the PeerHandler::dummy() method instead.
• Even though this works for now, we should review our init_rpc_api, as we should be able to start the RPC API without using a PeerHandler at all. L2: review P2P initialization #5222 was created to review this.

Closes None

[Copilot]

Pull Request Overview

This PR enables the use of dummy test methods for the L2 feature by adding feature = "l2" to the conditional compilation attributes and simplifies L2 initialization by using PeerHandler::dummy() instead of creating a full peer handler with initiator.

Key Changes:

• Extended #[cfg] attributes to include the "l2" feature for RLPxInitiator::dummy() and PeerHandler::dummy() methods
• Simplified L2 initialization to use PeerHandler::dummy() directly instead of creating a full RLPxInitiator and PeerHandler
• Removed unused RLPxInitiator import from L2 initializers

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
crates/networking/p2p/rlpx/initiator.rs	Added "l2" feature to cfg attribute and updated documentation for the dummy method
crates/networking/p2p/peer_handler.rs	Added "l2" feature to cfg attribute and updated documentation for the dummy method
cmd/ethrex/l2/initializers.rs	Removed RLPxInitiator import and replaced peer handler initialization with dummy call

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[github-actions]

Lines of code report

Total lines added: 0
Total lines removed: 1
Total lines changed: 1

Detailed view

+--------------------------------------+-------+------+
| File                                 | Lines | Diff |
+--------------------------------------+-------+------+
| ethrex/cmd/ethrex/l2/initializers.rs | 303   | -1   |
+--------------------------------------+-------+------+

[avilagaston9]

Addressed in #5253