op-e2e: Use chain specific file names for config in challenger helper

[ajsutton]

Description

When updating the op-e2e fault proof helpers to support interop, the filename that l2 genesis and rollup config files were written to wasn't made chain specific. So while it looped over every chain in the dep set, it was just overwriting the same file. Now the chain ID is included in the path to make the file unique per chain.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.39%. Comparing base (db1f42d) to head (c0f228b).
Report is 24 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #15091      +/-   ##
===========================================
- Coverage    46.51%   42.39%   -4.13%     
===========================================
  Files         1183     1011     -172     
  Lines       101032    90775   -10257     
===========================================
- Hits         47000    38486    -8514     
+ Misses       50688    49118    -1570     
+ Partials      3344     3171     -173     

Flag	Coverage Δ
cannon-go-tests-32	?
cannon-go-tests-64	?
contracts-bedrock-tests	?

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see 179 files with indirect coverage changes

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