chore(l1): renaming to remove metrics_ prefix from file names

[rodrigo-o]

Motivation

This was needed before when we didn't had a /metrics folder, now the prefix is unnecessary

Description

remove unnecessary metrics_ prefix from metric modules

Closes #5378

[github-actions]

Lines of code report

Total lines added: 399
Total lines removed: 1
Total lines changed: 400

Detailed view

+--------------------------------------------------+-------+------+
| File                                             | Lines | Diff |
+--------------------------------------------------+-------+------+
| ethrex/crates/blockchain/metrics/api.rs          | 48    | -1   |
+--------------------------------------------------+-------+------+
| ethrex/crates/blockchain/metrics/blocks.rs       | 164   | +164 |
+--------------------------------------------------+-------+------+
| ethrex/crates/blockchain/metrics/process.rs      | 84    | +84  |
+--------------------------------------------------+-------+------+
| ethrex/crates/blockchain/metrics/transactions.rs | 151   | +151 |
+--------------------------------------------------+-------+------+

[Copilot]

Pull Request Overview

This PR removes the unnecessary metrics_ prefix from metric module file names now that they reside in a dedicated /metrics folder, improving code organization and clarity.

Key changes:

• Renamed three core metric modules: metrics_blocks → blocks, metrics_transactions → transactions, metrics_process → process
• Updated all import statements across the codebase to reference the new module names

Reviewed Changes

Copilot reviewed 9 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
crates/blockchain/metrics/mod.rs	Updated module declarations to remove metrics_ prefix
crates/blockchain/metrics/api.rs	Updated imports to use new module names
crates/blockchain/metrics/blocks.rs	Renamed file (content appears to be moved from metrics_blocks.rs)
crates/blockchain/metrics/transactions.rs	Renamed file (content appears to be moved from metrics_transactions.rs)
crates/blockchain/metrics/process.rs	Renamed file (content appears to be moved from metrics_process.rs)
crates/blockchain/payload.rs	Updated imports to use new module names
crates/blockchain/blockchain.rs	Updated imports to use new module names
crates/blockchain/fork_choice.rs	Updated imports to use new module names
crates/l2/sequencer/metrics.rs	Updated imports to use new module names
crates/l2/sequencer/block_producer.rs	Updated imports to use new module names
crates/l2/sequencer/block_producer/payload_builder.rs	Updated imports to use new module names
cmd/ethrex/initializers.rs	Updated imports to use new module names

Comments suppressed due to low confidence (1)

crates/blockchain/metrics/mod.rs:42

• The documentation comment contains an outdated example that still references metrics_transactions. This should be updated to transactions to reflect the module rename.

// use ethrex_metrics::metrics_transactions::{METRICS_TX};

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