test(op-reth): guard negotiated eth wire protocol version

[joshklop]

Add an integration test that spins up two op-reth nodes, lets them complete the devp2p handshake, and asserts the negotiated eth subprotocol version is exactly 69.

The test is intentionally written to fail when upstream reth bumps the negotiated version (e.g. to eth/70). That failure is the signal: it forces a conscious review of the new version's behavior before we ship it, rather than silently inheriting a protocol change on the next reth bump.

[wiz-0f98cca50a]

Wiz Scan Summary

Scanner	Findings
Vulnerabilities	3  1  4
Sensitive Data	-
Secrets	-
IaC Misconfigurations	-
SAST Findings	-
Software Management Findings	-
Total	3  1  4

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.5%. Comparing base (de1b557) to head (df233b7).

❗ There is a different number of reports uploaded between BASE (de1b557) and HEAD (df233b7). Click for more details.

HEAD has 13 uploads less than BASE

Flag	BASE (de1b557)	HEAD (df233b7)
cannon-go-tests-64	1	0
contracts-bedrock-tests	12	0

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #20156      +/-   ##
===========================================
- Coverage     75.8%     0.5%   -75.3%     
===========================================
  Files          183      486     +303     
  Lines        10536    61736   +51200     
===========================================
- Hits          7987      320    -7667     
- Misses        2405    61416   +59011     
+ Partials       144        0     -144     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	?
unit	0.5% <ø> (?)

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see 669 files with indirect coverage changes

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