refactor: update SolanaRpcConnection instantiation with explicit URL #3067

Job	Run time
system-programs (account-compression, [ "cargo-test-sbf -p account-compression-test -- --test-thr...	30m 42s
system-programs (light-system-program, [ "cargo-test-sbf -p system-test -- --test-threads=1" ])	26m 5s
system-programs (light-registry, [ "cargo-test-sbf -p registry-test -- --test-threads=1" ])	17m 1s
system-programs (light-compressed-token, [ "cargo-test-sbf -p compressed-token-test -- --test-thr...	27m 58s
system-programs (system-cpi-test, [ "cargo-test-sbf -p system-cpi-test -- --test-threads=1" ])	20m 48s
system-programs (random-e2e-test, [ "RUST_MIN_STACK=8388608 cargo-test-sbf -p e2e-test -- --nocap...	18m 53s
	2h 21m 27s

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