Fix gungraun benchmark name (#778)

[gamma0987]

Fix gungraun benchmark name parsing to exclude (truncated) descriptions

This PR fixes the gungraun adapter to correctly parse benchmark names by using only the module path and optional id, excluding the description. Previously, the entire first line(s) (including truncated descriptions) was used as the benchmark name. The benchmark name is now also much shorter which makes it very unlikely to hit the MAX_BENCHMARK_NAME_LEN limit.

• Updated parsing logic in single_benchmark() to properly extract benchmark names.
• Updated tests:
  • Fixed existing test expectations (benchmark names no longer include descriptions)
  • Added test covering all valid ID formats

Before: file::group::function id:some description possibly truncated with ...
After: file::group::function id

Fixes: #778
Related: #638

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Bencher Report

Branch	fix-gungraun-benchmark-name
Testbed	intel-v1

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Benchmark	Latency	Benchmark Result microseconds (µs) (Result Δ%)	Upper Boundary microseconds (µs) (Limit %)
Adapter::Json	📈 view plot 🚷 view threshold	4.48 µs (-0.87%) Baseline: 4.52 µs	4.68 µs (95.70%)
Adapter::Magic (JSON)	📈 view plot 🚷 view threshold	4.36 µs (-0.62%) Baseline: 4.39 µs	4.56 µs (95.62%)
Adapter::Magic (Rust)	📈 view plot 🚷 view threshold	25.36 µs (+0.41%) Baseline: 25.25 µs	26.37 µs (96.15%)
Adapter::Rust	📈 view plot 🚷 view threshold	3.39 µs (-0.60%) Baseline: 3.41 µs	3.55 µs (95.42%)
Adapter::RustBench	📈 view plot 🚷 view threshold	3.37 µs (-0.89%) Baseline: 3.41 µs	3.54 µs (95.27%)

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