perf(swc_error_reporters): avoid creating miette handler when no diagnostics

[colinaaa]

Description:

Automatically prevent the creation of miette::GraphicalReportHandler when no diagnostics are present.

BREAKING CHANGE: No

Related issue (if exists):

See performance regression in web-infra-dev/rspack#11006

[changeset-bot]

⚠️ No Changeset found

Latest commit: be46f91

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[codspeed-hq]

CodSpeed Performance Report

Merging #10852 will not alter performance

_{Comparing colinaaa:colin/0714/to_pretty_string (be46f91) with main (7c57fbb)}

Summary

✅ 140 untouched benchmarks

[kdy1]

Published with fd8b799