Reuse TxFilterConfig in L1-Scan Guest code

[MdTeach]

Description

Instead of computing a new TxFilterConfig for each L1 block scan, reuse the same TxFilterConfig for the entire batch.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature/Enhancement (non-breaking change which adds functionality or enhances an existing one)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactor
• New or updated tests
• Dependency Update

Notes to Reviewers

Checklist

• I have performed a self-review of my code.
• I have commented my code where necessary.
• I have updated the documentation if needed.
• My changes do not introduce new warnings.
• I have added tests that prove my changes are effective or that my feature works.
• New and existing tests pass with my changes.

Related Issues

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.78%. Comparing base (22f0e74) to head (0718a38).
Report is 9 commits behind head on main.

@@            Coverage Diff             @@
##             main     #611      +/-   ##
==========================================
- Coverage   56.82%   56.78%   -0.05%     
==========================================
  Files         308      308              
  Lines       32367    32404      +37     
==========================================
+ Hits        18394    18402       +8     
- Misses      13973    14002      +29     

Files with missing lines	Coverage Δ
crates/proof-impl/btc-blockspace/src/filter.rs	50.00% <100.00%> (-3.85%)	⬇️
crates/proof-impl/btc-blockspace/src/logic.rs	97.43% <100.00%> (+0.13%)	⬆️
crates/proof-impl/btc-blockspace/src/scan.rs	100.00% <100.00%> (ø)
crates/proof-impl/l1-batch/src/logic.rs	97.50% <100.00%> (+0.27%)	⬆️

... and 16 files with indirect coverage changes

[github-actions]

Commit: 477a44d

SP1 Performance Test Results

program	cycles	success
BTC_BLOCKSPACE	7,239,605	✅
EL_BLOCK	100,495	✅
CL_BLOCK	55,340	✅
L1_BATCH	7,268,989	✅
L2_BATCH	5,448	✅
CHECKPOINT	15,322	✅