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

`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

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

```text
… 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.

Inspect libjsonnet.cpp, starting with builtinParseJson and the json::parse call used by builtinParseYaml. Run the provided build and jsonnet reproductions first; done means overflowing JSON and YAML numbers produce a Jsonnet RuntimeError rather than escaping to CATCH and aborting, while the existing parse-error behavior remains intact.

Written by the indexing model from the issue text.