refactor(sourcemap): remove unnecessary reserves

[overlookmotel]

Vec::reserve before Vec::extend is unnecessary where extending from a "trusted" iterator which accurately reports its length. Rust already reserves required space in these cases.

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[overlookmotel]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• refactor(sourcemap): remove unnecessary reserves #4635 👈
• perf(sourcemap): ConcatSourceMapBuilder extend source_contents in separate loop #4634 : 1 other dependent PR (#4638 )
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #4635 will not alter performance

_{Comparing 08-05-refactor_sourcemap_remove_unnecessary_reserve_s (3be8660) with 08-04-perf_sourcemap_concatsourcemapbuilder_extend_source_contents_in_separate_loop (0198b30)}

Summary

✅ 32 untouched benchmarks