Fix integration tests for sei-db record not found

[Kbhat1]

Describe your changes and provide context

This PR resolves integration test failures stemming from a sei-db update (sei-protocol/sei-db#105) that now errors ("record not found") for missing keys.

Key changes:

• EVM Keeper Receipt Retrieval: x/evm/keeper/receipt.go now treats sei-db's "record not found" as a normal miss, falling back to legacy KV store for receipt lookups.
• EVM RPC Safety: evmrpc/utils.go introduces safeVersionExists to prevent RPC calls (e.g., eth_call, debug_call) from crashing on missing state versions by handling "record not found" panics.
• Receipt Migration & Utilities: Fixed MigrateLegacyReceiptsBatch to correctly parse hashes and use ApplyChangeset, added DeleteTransientReceipt, and updated getTestKeyring signature.

These adjustments harden the chain code against the new sei-db behavior, ensuring stability and test pass rates.

Testing performed to validate your change

• go build ./...
• go test ./evmrpc
• Receipt migration test in x/evm/keeper

---

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[codecov]

Codecov Report

❌ Patch coverage is 59.18367% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.47%. Comparing base (6d8e2b8) to head (c96dd6a).
⚠️ Report is 1 commits behind head on BumpSeidb.

Files with missing lines	Patch %	Lines
evmrpc/utils.go	41.17%	8 Missing and 2 partials ⚠️
x/evm/keeper/receipt.go	68.75%	5 Missing and 5 partials ⚠️

❌ Your patch status has failed because the patch coverage (59.18%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           BumpSeidb    #2366   +/-   ##
==========================================
  Coverage      60.47%   60.47%           
==========================================
  Files            314      314           
  Lines          31071    31096   +25     
==========================================
+ Hits           18790    18806   +16     
- Misses         10973    10978    +5     
- Partials        1308     1312    +4     

Files with missing lines	Coverage Δ
evmrpc/utils.go	69.80% <41.17%> (-3.08%)	⬇️
x/evm/keeper/receipt.go	73.30% <68.75%> (+3.08%)	⬆️

... and 1 file with indirect coverage changes

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