fix(l1): bound startup RPC calls with per-call timeouts

[rodrodros]

Adding context deadlines to the interactions with the L1 to avoid node stalling for ever

[codecov]

Codecov Report

❌ Patch coverage is 94.33962% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.32%. Comparing base (345d918) to head (0ffcd0d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
l1/l1.go	96.15%	2 Missing ⚠️
node/migration.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3676      +/-   ##
==========================================
+ Coverage   76.29%   76.32%   +0.02%     
==========================================
  Files         396      396              
  Lines       36537    36579      +42     
==========================================
+ Hits        27877    27918      +41     
- Misses       6683     6686       +3     
+ Partials     1977     1975       -2     

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[RafaelGranza]

LGTM!

I adde a small PR description for future clarity.
The title covers the what but not the why.

Also, I left a few nits.