* feat(op-dispute-mon): L2BlockNumberChallenged dispute monitor support

feat(op-dispute-mon): query for the l2 block number through the game metadata call

fix(op-dispute-mon): query for the l2 block number through the game metadata call

fix(op-dispute-mon): query for the l2 block number through the game metadata call

* fix(op-dispute-mon): block challenge check

* fix(op-dispute-mon): use agreement and metrice

* op-dispute-mon: Separate l2 challenge metric (#10483)

* op-dispute-mon: Consider l2 block number challenged when forecasting but don't make it a new game status.

Add a separate metric to report the number of successful L2 block number challenges.

* op-challenger: Remove unused blockNumChallenged field from list-games info struct

* op-dispute-mon: Consider l2 block challenger in expected credits. (#10484)

* feat(op-dispute-mon): Update L2 Challenges Metrics (#10492)

* fix: change the l2 challenges to tha gauge vec

* fix: consistent metric labels

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Co-authored-by: refcell <abigger87@gmail.com>

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Co-authored-by: Adrian Sutton <adrian@oplabs.co>