refactor(ast/estree): generalize concatenating fields with Concat2

[overlookmotel]

Pure refactor. Replace AppendTo and AppendToConcat which are used in ESTree serializer to concatenate 2 fields with a more generalized Concat2, which performs both functions.

[overlookmotel]

• refactor(ast): remove quotes from #[estree(append_to)] attributes #10863
• refactor(ast/estree): use #[estree(prepend_to)] #10862
• feat(ast_tools): support #[estree(prepend_to)] #10849
• refactor(ast/estree): generalize concatenating fields with Concat2 #10848 👈 (View in Graphite)
• main

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #10848 will not alter performance

_{Comparing 05-07-refactor_ast_estree_generalize_concatenating_fields_with_concat2_ (b16331e) with main (087af52)}

Summary

✅ 36 untouched benchmarks

[overlookmotel]

Pure refactor, so merging without review.

[overlookmotel]

Merge activity

• May 7, 8:56 AM EDT: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• May 7, 8:56 AM EDT: Graphite disabled "merge when ready" on this PR due to: a merge conflict with the target branch; resolve the conflict and try again..
• May 7, 8:56 AM EDT: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• May 7, 9:18 AM EDT: overlookmotel added this pull request to the Graphite merge queue.
• May 7, 9:31 AM EDT: Merged by the Graphite merge queue.