test(ast/estree): more tests for escaping strings in JSON

[overlookmotel]

There were no tests covering escaping backslashes in JSON. Add some.

[overlookmotel]

• test(ast/estree): more tests for escaping strings in JSON #11756 👈 (View in Graphite)
• perf(ast/estree): faster serializing strings to JSON #11753
• main

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #11756 will improve performances by 15.26%

_{Comparing 06-16-test_ast_estree_more_tests_for_escaping_strings_in_json (c53a7bd) with 06-16-perf_ast_estree_faster_serializing_strings_to_json (c4faee2)}

Summary

⚡ 1 improvements
✅ 37 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	mangler[cal.com.tsx]	3.5 ms	3.1 ms	+15.26%

[Boshen]

Merge activity

• Jun 17, 2:07 AM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Jun 17, 2:07 AM UTC: Boshen added this pull request to the Graphite merge queue.
• Jun 17, 2:15 AM UTC: Merged by the Graphite merge queue.