fix(theme): use black contrastText for warning color to meet WCAG AA

[NethmikaKekuu]

Purpose

White text on the warning (orange) palette color fails the 4.5:1 contrast ratio required for WCAG 2.1 AA (as low as ~1.9:1 in the worst case), making small Chip/Badge labels like "Beta" nearly illegible. Switch warning.contrastText to black across WSO2Theme, PaleIndigo, and PaleGray, matching the approach HighContrastTheme already used. All affected combinations now exceed 5.5:1.

Related Issues

• Closes Background and foreground colors do not have a sufficient contrast ratio #521

Related PRs

• N/A

Checklist

• Followed the CONTRIBUTING guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
• Unit tests provided. (Add links if there are any)
• Storybook stories updated/added (if applicable)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines?
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets?

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 258a4a22-871e-41c6-b63e-6478a3a0b15a

📥 Commits

Reviewing files that changed from the base of the PR and between a588871 and 9e1316c.

📒 Files selected for processing (3)

• packages/oxygen-ui/src/styles/Themes/PaleGray.ts
• packages/oxygen-ui/src/styles/Themes/PaleIndigo.ts
• packages/oxygen-ui/src/styles/Themes/WSO2Theme.ts

✨ Finishing Touches

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• Create PR with unit tests

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[NethmikaKekuu]

@sm1990 could you please reveiw this pr