soroban-rpc: Remove panics from internal codebase #3220

Job	Run time
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	2m 58s
Integration tests (ubuntu-20.04, 1.21, .CLI.)	21m 35s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	4m 3s
Integration tests (ubuntu-20.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	17m 35s
Build (macos-latest, x86_64-apple-darwin, amd64)	6m 40s
Integration tests (ubuntu-22.04, 1.21, .CLI.)	20m 38s
Build (macos-latest, aarch64-apple-darwin, arm64)	3m 20s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	8m 34s
Integration tests (ubuntu-22.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	17m 5s
Unit tests (ubuntu-20.04, 1.21)	8m 14s
Unit tests (ubuntu-22.04, 1.21)	9m 36s
	2h 0m 18s

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