fix(dx/codegen): don't insert module into biome_rule_options/src/lib.rs if it already exists

[dyc3]

Summary

fixes #7703

Test Plan

manually tested

Docs

[changeset-bot]

⚠️ No Changeset found

Latest commit: 160dc38

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[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	52832	52832	0
Passed	51614	51614	0
Failed	1176	1176	0
Panics	42	42	0
Coverage	97.69%	97.69%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	38	38	0
Passed	37	37	0
Failed	1	1	0
Panics	0	0	0
Coverage	97.37%	97.37%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	6300	6300	0
Passed	2085	2085	0
Failed	4215	4215	0
Panics	0	0	0
Coverage	33.10%	33.10%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	626	626	0
Passed	560	560	0
Failed	66	66	0
Panics	0	0	0
Coverage	89.46%	89.46%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	18854	18854	0
Passed	14053	14053	0
Failed	4800	4800	0
Panics	1	1	0
Coverage	74.54%	74.54%	0.00%

[coderabbitai]

Walkthrough

The change adds idempotent logic to the code generator's register_analyzer_rule_options function. It checks whether a pub mod declaration already exists in lib.rs before appending a new one, preventing duplicate module declarations. When a module declaration is found to already exist, the function returns early; otherwise, it appends the declaration to the file.

Suggested labels

A-Tooling, A-Linter

Suggested reviewers

• ematipico

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the fix: preventing duplicate module insertions into lib.rs, which directly addresses the main changeset.
Description check	✅ Passed	The description references issue #7703 and mentions manual testing, relating to the codegen fix for duplicate module entries.
Linked Issues check	✅ Passed	The changes implement idempotent module declaration logic by checking if a pub mod entry exists before appending, directly addressing issue #7703's requirement.
Out of Scope Changes check	✅ Passed	All changes focus on the guard logic in register_analyzer_rule_options function to prevent duplicate module declarations, staying within the scope of fixing issue #7703.

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✨ Finishing touches

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