Deprecate legacy network fallback configuration

[dotandev]

Remove logic trying to hit obsolete testnet endpoints. Future upgrades should strictly use the defined RPC URL.

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[abdulomeiza]

@abdulomeiza has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I am a Full Stack Developer specializing in Next.js,Python, TypeScript, Node.js,Rust, PostgreSQL,Oracle, JavaScript and DevOps Engineering. With over 50 contributions across projects in webI am a Full Stack Developer specializing in Next.js,Python, TypeScript, Node.js,Rust, PostgreSQL,Oracle, JavaScript and DevOps Engineering. With over 50 contributions across projects in web3 and specifically stellar ecosystem, I’ve developed strong proficiency in delivering high-quality solutions and resolving complex issues within tight deadlines. My experience spans frontend, backend, smart contracts, and the optimization and maintenance of scalable codebases.
I can handle this task. Kindly assign.3 and specifically stellar ecosystem, I’ve developed strong proficiency in delivering high-quality solutions and resolving complex issues within tight deadlines. My experience spans frontend, backend, smart contracts, and the optimization and maintenance of scalable codebases.
I can handle this task. Kindly assign.

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