Accessibility improvement in Choose New Password page

[HabibSentongo]

Fixes #5502

• Add onKeyDown handler function to check for Enter/Return key press.
• Register this handler function on both input fields.
• Add tests for this added functionality.

[Zangetsu101]

Great work @HabibSentongo . Just one small change request

[github-actions]

Oops! Looks like you forgot to update the changelog. When updating CHANGELOG.md, please consider the following:

• Changelog is read by country implementors who might not always be familiar with all technical details of OpenCRVS. Keep language high-level, user friendly and avoid technical references to internals.
• Answer "What's new?", "Why was the change made?" and "Why should I care?" for each change.
• If it's a breaking change, include a migration guide answering "What do I need to do to upgrade?".

[Zangetsu101]

@HabibSentongo It looks like the tests are failing. You can ignore the one that's unrelated to your changes i.e. the FormFieldGenerator test but some of the tests that you wrote for the ChangePassword page are failing. You can run the tests locally by "cd"ing into packages/client and running yarn test
Pro tip: you can run tests for a single file too by running something like this yarn test:watch ChangePassword