Implement RPC Ledger Mock Tests

[dotandev]

internal/rpc/ledger_test.go has a TODO because it skips tests requiring a live RPC connection. Use the newly added internal/simulator/mock.go to implement robust offline tests for ledger interactions.

Files to change:
internal/rpc/ledger_test.go

[TS-mfon]

@TS-mfon has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Gm

Please can I work on this issue

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[0xDeon]

@0xDeon has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello maintainer, please can i be assigned this issue?

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[Sam-Rytech]

@Sam-Rytech has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi maintainer

I'd like to work on this issue

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[drips-wave]

Congratulations, @TS-mfon! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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