transactions: remove redundant arg from VerifiedTransactionCache

[cce]

Summary

VerifiedTransactionCache contains these interface methods, introduced in #1757

Add(txgroup []transactions.SignedTxn, groupCtx *GroupContext)
AddPayset(txgroup [][]transactions.SignedTxn, groupCtx []*GroupContext)

But since GroupContext already contains the txgroup, the first arg is redundant.

Test Plan

• Add panic assertions that these two values are always equal
• Remove first arg from interface methods and update code
• Existing tests should pass

[codecov]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.64%. Comparing base (8245ed1) to head (5808939).
⚠️ Report is 6 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
data/transactions/verify/verifiedTxnCache.go	0.00%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6444      +/-   ##
==========================================
- Coverage   50.84%   50.64%   -0.20%     
==========================================
  Files         664      657       -7     
  Lines      111455   111364      -91     
==========================================
- Hits        56665    56405     -260     
- Misses      51924    52080     +156     
- Partials     2866     2879      +13     

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[Copilot]

Pull Request Overview

This PR removes redundant transaction group parameters from the VerifiedTransactionCache interface methods. Since GroupContext already contains the transaction group via its signedGroupTxns field, passing the transaction group separately was unnecessary duplication.

• Removed the first txgroup parameter from Add and AddPayset methods in the interface
• Updated all implementations and callers to use only the GroupContext parameter
• Simplified the internal add method to extract transaction group from GroupContext

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
data/transactions/verify/verifiedTxnCache.go	Updated interface definition and implementation to remove redundant txgroup parameters
data/transactions/verify/txnBatch.go	Updated calls to cache methods and removed now-unused verifiedTxnGroups slice
data/transactions/verify/txn.go	Updated cache method calls to pass only GroupContext
data/transactions/verify/verifiedTxnCache_test.go	Updated test code to use new method signatures and properly prepare GroupContext
data/txHandler_test.go	Updated mock implementation to match new interface

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