Fix: Add missing Arbitrum block_height

[marcellorigotti]

Pull Request

Closes: PRO-xxx

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have written sufficient tests.
• I have written and tested required migrations.
• I have updated documentation where appropriate.

Summary

Include arbitrum block_height in the monitoring rpc

Non-Breaking changes

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71%. Comparing base (1a3cadb) to head (ba917a7).

Files	Patch %	Lines
state-chain/runtime/src/lib.rs	0%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #5126    +/-   ##
======================================
- Coverage     71%     71%    -0%     
======================================
  Files        460     460            
  Lines      81649   81507   -142     
  Branches   81649   81507   -142     
======================================
- Hits       58169   57969   -200     
- Misses     20390   20443    +53     
- Partials    3090    3095     +5     

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