fix: [UIE-10152] - Fix html injection vuln in open Support Ticket and Quotas Increase Form.

[tanushree-akamai]

Description 📝

Fix html injection vuln in open Support Ticket and Quotas Increase Form.

Changes 🔄

• Enhance sanitizeConfigs to block anchor tags in Markdown Component while preserving safe Markdown formatting in TicketDetailText component
• Enhance sanitizeConfigs to block anchor tags in Markdown Component while preserving safe Markdown formatting in QuotasIncreaseForm.
• Centralized sanitizeOptions.ts for consistency in constants.

Scope 🚢

Upon production release, changes in this PR will be visible to:

• All customers
• Some customers (e.g. in Beta or Limited Availability)
• No customers / Not applicable

Preview 📷

SupportTicketDialog
Before

After

QuotasIncreaseForm
Before

After

How to test 🧪

Verification steps

• Open DevTools Panel
• In DevTools Panel, enable CRUD MSW
• Navigate to /linodes
• Click on Open Support Ticket (verify with required payload)
• Navigate to /quotas
• Click on Quota increase form (verify with required payload)

Author Checklists

As an Author, to speed up the review process, I considered 🤔

👀 Doing a self review
❔ Our contribution guidelines
🤏 Splitting feature into small PRs
➕ Adding a changeset
🧪 Providing/improving test coverage
🔐 Removing all sensitive information from the code and PR description
🚩 Using a feature flag to protect the release
👣 Providing comprehensive reproduction steps
📑 Providing or updating our documentation
🕛 Scheduling a pair reviewing session
📱 Providing mobile support
♿ Providing accessibility support

• I have read and considered all applicable items listed above.

As an Author, before moving this PR from Draft to Open, I confirmed ✅

• All tests and CI checks are passing
• TypeScript compilation succeeded without errors
• Code passes all linting rules

[linode-gh-bot]

Cloud Manager UI test results

🔺 1 failing test on test run #3 ↗︎

❌ Failing	✅ Passing	↪️ Skipped	🕐 Duration
1 Failing	865 Passing	11 Skipped	37m 12s

Details

Failing Tests
	Spec	Test
❌	account-switching.spec.ts	Cloud Manager Cypress Tests→Parent/Child account switching→From Parent to Child » can search child accounts

Troubleshooting

Use this command to re-run the failing tests:

pnpm cy:run -s "cypress/e2e/core/parentChild/account-switching.spec.ts"