[Fix] Call GetL1Message in l2watcher

[noel2004]

We added a new RPC scroll_getL1MessagesInBlock in l2geth validium mode, however, this is not yet implemented in the Go SDK. As as simple workaround, this PR adds the ability to perform raw RPC calls, bypassing ethClient.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 42.10526% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.50%. Comparing base (a7543d4) to head (32e208f).

Files with missing lines	Patch %	Lines
rollup/cmd/rollup_relayer/app/app.go	0.00%	4 Missing ⚠️
common/testcontainers/testcontainers.go	62.50%	2 Missing and 1 partial ⚠️
rollup/cmd/permissionless_batches/app/app.go	0.00%	3 Missing ⚠️
rollup/internal/controller/watcher/l2_watcher.go	75.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           feat/cloak    #1749      +/-   ##
==============================================
- Coverage       36.77%   36.50%   -0.28%     
==============================================
  Files             247      247              
  Lines           21049    21186     +137     
==============================================
- Hits             7741     7733       -8     
- Misses          12481    12630     +149     
+ Partials          827      823       -4     

Flag	Coverage Δ
common	29.69% <62.50%> (+0.15%)	⬆️
coordinator	32.37% <ø> (-0.42%)	⬇️
database	42.05% <ø> (ø)
rollup	35.24% <27.27%> (-0.61%)	⬇️

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