fix(rpcv10): recompute trace if initial_reads requested

[brbrr]

There is an ordering issue with RPC trace cache for block transactions - we cache only by block hash, so we could end up with a situation where the cache was populated with trace without initial reads, and when the caller request same tries but with initial_reads, we'd just return cached response (with missing initial_reads)

[Copilot]

Pull request overview

Fixes an ordering issue in the RPC v10 block trace cache where a cached trace computed without initial reads could be incorrectly reused for a later request with RETURN_INITIAL_READS.

Changes:

• Adjusts traceBlockTransactions cache-hit logic to re-trace via VM when initial reads are requested but missing in the cached entry.
• Avoids re-fetching from feeder gateway when cached traces already exist, while still returning an empty InitialReads when requested (since GW can’t supply them).
• Adds tests to verify cache coherence across different call orderings (TraceTransaction then TraceBlockTransactions, repeat calls, and flag/no-flag sequences).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
rpc/v10/trace.go	Updates cache-hit and feeder-gateway logic to prevent returning a cached response missing initial reads when RETURN_INITIAL_READS is requested.
rpc/v10/trace_test.go	Adds regression tests that validate the cache is not “poisoned” by earlier calls without initial reads and that cache reuse behaves as intended.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.85%. Comparing base (4310ba5) to head (ccf42cf).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3583      +/-   ##
==========================================
+ Coverage   75.77%   75.85%   +0.07%     
==========================================
  Files         380      380              
  Lines       34190    34187       -3     
==========================================
+ Hits        25909    25932      +23     
+ Misses       6456     6427      -29     
- Partials     1825     1828       +3     

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[EgeCaner]

Looks good to me, thank you!