[WIP] Update React version to v19

[pavinduLakshan]

Purpose

$subject

Related Issues

• N/A

Related PRs

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Checklist

• e2e cypress tests locally verified. (for internal contributers)
• Manual test round performed and verified.
• UX/UI review done on the final implementation.
• Documentation provided. (Add links if there are any)
• Relevant backend changes deployed and verified
• Unit tests provided. (Add links if there are any)
• Integration tests provided. (Add links if there are any)

Security checks

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

[wso2-jenkins-bot]

⚠️ No Changeset found

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go.

If these changes should result in a version bump, you need to add a changeset.

Refer Release Documentation to learn how to add a changeset.

[brionmario]

The new update batching introduced with v18 caused some of the UIs in the Console to break (AFAIR, application protocols).

And we reverted to the legacy mode as a workaround: wso2/product-is#14912

Just FYI

[pavinduLakshan]

Thanks for the info. However, we won't be able to upgrade to v19 anytime soon, as most of our dependencies are not yet ready to support v19. We may hopefully be able to figure out a solution for this by the time we are about to upgrade :)