Disable submit buttons in patient registration and encounter form when request is being processed

[rithviknishad]

Proposed Changes

• Disable submit buttons in patient registration and encounter form when request is being processed to avoid probable race conditions.

@coronasafe/care-fe-code-reviewers @coronasafe/code-reviewers

Merge Checklist

• Add specs that demonstrate bug / test a new feature.
• Update product documentation.
• Ensure that UI text is kept in I18n files.
• Prep screenshot or demo video for changelog entry, and attach it to issue.
• Request for Peer Reviews
• Completion of QA

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[rithviknishad]

Closing as new PR will be raised to avoid potential race conditions by using abort controller, as the disable logic does not have any effect as it'd anyways be in loading state even when the button is clicked.