refactor(parser): shorten code

[overlookmotel]

Pure refactor. Shorten code by using more specific AstBuilder methods to construct enums.

[overlookmotel]

• refactor(parser): remove unnecessary unbox #12302
• refactor(parser): shorten code #12301 👈 (View in Graphite)
• main

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #12301 will not alter performance

_{Comparing 07-13-refactor_parser_shorten_code (1058e8a) with main (04e6a2f)}

Summary

✅ 34 untouched benchmarks

[graphite-app]

Merge activity

• Jul 16, 1:18 AM UTC: Boshen added this pull request to the Graphite merge queue.
• Jul 16, 1:28 AM UTC: Merged by the Graphite merge queue.