std.parseJson / std.parseYaml: number overflow (out_of_range.406) aborts the process

[liuyi1231]

std.parseJson only catches nlohmann::json::parse_error. Overflowing numbers raise out_of_range.406, which escapes to CATCH in libjsonnet.cpp and abort()s. Same for std.parseYaml("1E999") (RapidYAML → json::parse without catching out_of_range).

Same gap as #680 / #951 (parse_error only). Tip 2ef32ab / CLI v0.22.0.

Repro

git clone https://github.com/google/jsonnet.git
cd jsonnet && make -j$(nproc)
./jsonnet -e 'std.parseJson("1E999")'

… out_of_range.406 … number overflow parsing '1E999'
Aborted (core dumped)  # exit 134

./jsonnet -e 'std.parseYaml("1E999")' → same abort.
./jsonnet -e 'std.parseJson("{")' → RuntimeError, no abort.
./jsonnet -e 'std.parseJson("1e2")' → 100.

Fix

Catch json::exception (or out_of_range) in builtinParseJson and around json::parse in builtinParseYaml; throw makeError(...) like #951.