soroban-rpc: Remove panics from internal codebase #3235

Job	Run time
Integration tests (ubuntu-20.04, 1.21, .CLI.)	16m 15s
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	2m 14s
Integration tests (ubuntu-20.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	14m 54s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	2m 48s
Unit tests (ubuntu-20.04, 1.21)	7m 38s
Integration tests (ubuntu-22.04, 1.21, .CLI.)	16m 57s
Build (macos-latest, x86_64-apple-darwin, amd64)	5m 58s
Unit tests (ubuntu-22.04, 1.21)	8m 50s
Integration tests (ubuntu-22.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	15m 11s
Build (macos-latest, aarch64-apple-darwin, arm64)	5m 7s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	10m 6s
	1h 45m 58s

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