fix(tools): repair no-op --check in op-chain-config generator and update generated configs

[popescuoctavian]

The --check of op-chain-config generator which runs in CI was always succeeding. I've discovered this while testing #1639.

Problem

The cargo op-chain-config -- --check step in the "Check generated files" workflow has never detected out-of-date configs. It used git diff -G'' --exit-code, which was broken three ways:

• The single quotes were part of the argument (Command::arg passes it verbatim — no shell strips them), so the pattern could never match.
• The slashes were doubled (https:////github.com//...) as if they needed escaping.
• -G selects files whose changed lines match the regex; the intent ("ignore the // source: line") requires --ignore-matching-lines (-I), which discounts matching lines instead.

Changes

Generator (crates/tool/op_chain_config_generator):

• Use git diff --ignore-matching-lines='^// source: ...' with a corrected regex, scoped to the generated paths, so SHA-only changes pass and any real drift fails.
• Wipe the generated directory before regenerating, so chains removed from the registry no longer leave stale modules behind.
• Fix the --check rollback: it missed generated.rs (the generated/* pathspec doesn't cover it) and couldn't remove newly generated untracked files (now handled with a scoped git clean).

Workflow (.github/workflows/check-generated-files.yml):

• Removed the redundant cargo op-chain-config generation step before the --check step — a leftover of the workflow's original implementation; --check regenerates on its own.

Regenerated configs (first regeneration since December):

• Added: Celo Sepolia.
• Removed (removed upstream from the registry): Arena-Z, Swell, Creator Chain testnet, Ethernity Sepolia, Base (mainnet + Sepolia).

Dropped built-in Base support (crates/edr_op):

• Beyond the regenerated configs, removed the hand-written Base hardfork activations (hardfork/base.rs) and the Base-specific tests. Base no longer follows the OP stack protocol, so EDR's OP chain configs cannot represent it correctly. If EDR supports Base again, it should model Base's own protocol.
• Added a changeset for the removed built-in chain configurations.

[changeset-bot]

🦋 Changeset detected

Latest commit: 5785b20

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@nomicfoundation/edr	Minor

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[codecov]

Codecov Report

❌ Patch coverage is 62.96296% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.89%. Comparing base (f0df8b5) to head (5785b20).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/tool/op_chain_config_generator/src/main.rs	0.00%	20 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1641      +/-   ##
==========================================
- Coverage   80.02%   79.89%   -0.13%     
==========================================
  Files         464      460       -4     
  Lines       80392    80024     -368     
  Branches    80392    80024     -368     
==========================================
- Hits        64330    63937     -393     
- Misses      13856    13882      +26     
+ Partials     2206     2205       -1     

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[anaPerezGhiglia]

LGTM! thanks for pushing for fixing this! 🙇