refactor(ast/estree): simplify static converters

[overlookmotel]

Pure refactor. Simplify the converters which produce static values e.g. null. They can contain a T rather than a &T - T is generic, so can be a & itself.

#10192 made me realize this was more complex than it needed to be.

[overlookmotel]

• refactor(ast/estree): simplify static converters #10197 👈 (View in Graphite)
• main

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[overlookmotel]

No change to serialized output, so merging without review.

[overlookmotel]

Merge activity

• Apr 3, 6:38 AM EDT: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Apr 3, 6:47 AM EDT: overlookmotel added this pull request to the Graphite merge queue.
• Apr 3, 6:56 AM EDT: Merged by the Graphite merge queue.

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #10197 will degrade performances by 3.42%

_{Comparing 04-03-refactor_ast_estree_simplify_simple_converters (5525206) with main (db0b2eb)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 34 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	formatter[antd.js]	7.9 ms	7.6 ms	+3.88%
❌	formatter[typescript.js]	7.2 ms	7.4 ms	-3.42%