chore(evmrpc): eth_getBlockReceipts not-found behavior parity

[mojtaba-esk]

Describe your changes and provide context

Closes PLT-163

Ref PLT-163

Testing performed to validate your change

=== RUN   TestEVMRPCSpec/eth_getBlockReceipts/get-block-receipts-empty.iox
    rpc_io_test.go:79: [DEBUG] SEI_EVM_IO_SEED_BLOCK=""
    rpc_io_test.go:114: [DEBUG] pair 1: placeholders=[] bindings=map[]
    rpc_io_test.go:129: [DEBUG] pair 1: request {"jsonrpc":"2.0","id":1,"method":"eth_getBlockReceipts","params":["0x0000000000000000000000000000000000000000000000000000000000000000"]}
    rpc_io_test.go:144: [DEBUG] pair 1: bindings after apply: map[]
=== RUN   TestEVMRPCSpec/eth_getBlockReceipts/get-block-receipts-not-found.iox
    rpc_io_test.go:79: [DEBUG] SEI_EVM_IO_SEED_BLOCK=""
    rpc_io_test.go:114: [DEBUG] pair 1: placeholders=[] bindings=map[]
    rpc_io_test.go:129: [DEBUG] pair 1: request {"jsonrpc":"2.0","id":1,"method":"eth_getBlockReceipts","params":["0x00000000000000000000000000000000000000000000000000000000deadbeef"]}
    rpc_io_test.go:144: [DEBUG] pair 1: bindings after apply: map[]
--- PASS: TestEVMRPCSpec (0.00s)
    --- PASS: TestEVMRPCSpec/eth_getBlockReceipts/get-block-receipts-empty.iox (0.00s)
    --- PASS: TestEVMRPCSpec/eth_getBlockReceipts/get-block-receipts-not-found.iox (0.00s)

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 13, 2026, 1:13 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.59%. Comparing base (e4f1ad1) to head (0456217).

Additional details and impacted files

@@                                   Coverage Diff                                    @@
##           mojtaba/evmrpc-return-null-for-unknown/empty-block-hash    #3068   +/-   ##
========================================================================================
  Coverage                                                    58.58%   58.59%           
========================================================================================
  Files                                                         2080     2080           
  Lines                                                       171660   171664    +4     
========================================================================================
+ Hits                                                        100573   100579    +6     
+ Misses                                                       62165    62164    -1     
+ Partials                                                      8922     8921    -1     

Flag	Coverage Δ
sei-chain-pr	67.33% <100.00%> (+0.08%)	⬆️
sei-db	70.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
evmrpc/block.go	76.71% <100.00%> (+0.32%)	⬆️

... and 1 file with indirect coverage changes

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[masih]

Easy peasy 🙌