[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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