[PM-17496] Migrate eslint to flat config

[Hinton]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-17496

📔 Objective

The legacy config is deprecated and will be removed in eslint 10. The flat config also allows us to write js functions which will assist in handling limitations with multiple identical rules.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – d6516aad-11b4-4150-ab09-36c5c7468d67

New Issues (1)

Checkmarx found the following issues in this Pull Request

Severity	Issue	Source File / Package	Checkmarx Insight
	Missing_HSTS_Header	/libs/common/src/services/api.service.ts: 243	details The web-application does not define an HSTS header, leaving it vulnerable to attack. Attack Vector

Fixed Issues (5)

Great job! The following issues were fixed in this Pull Request

Severity	Issue	Source File / Package
	Client_Privacy_Violation	/libs/tools/generator/components/src/username-generator.component.html: 3
	Client_DOM_Open_Redirect	/apps/web/src/app/billing/organizations/payment-method/organization-payment-method.component.ts: 155
	Client_DOM_Open_Redirect	/apps/web/src/app/billing/shared/payment-method.component.ts: 155
	Client_DOM_Open_Redirect	/apps/web/src/app/billing/organizations/payment-method/organization-payment-method.component.ts: 187
	Client_DOM_Open_Redirect	/apps/web/src/app/billing/shared/payment-method.component.ts: 183

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 35.24%. Comparing base (0e3e3c1) to head (622ef3e).
Report is 10 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...autofill/content/components/.lit-storybook/main.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12806      +/-   ##
==========================================
- Coverage   35.25%   35.24%   -0.01%     
==========================================
  Files        2997     2997              
  Lines       90887    90886       -1     
  Branches    16973    16973              
==========================================
- Hits        32041    32034       -7     
- Misses      56358    56364       +6     
  Partials     2488     2488              

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[coltonhurst]

Autofill changes look good 👍