Adrienne/Fixed floating-point notations on buy/sell ads input amount

[adrienne-deriv]

Changes:

Please include a summary of the change and which issue is fixed below:

• Fixed an issue where floating-point scientific notations are able to be entered in the buy/sell input amount, this includes characters such as e, E, -, + as pictured below:

• Created validation to check for floating-point representations exclusive of scientific notations and negative numbers

When you need to add unit test

• If this change disrupt current flow
• If this change is adding new flow

When you need to add integration test

• If components from external libraries are being used to define the flow, e.g. @deriv/components
• If it relies on a very specific set of props with no default behavior for the current component.

Test coverage checklist (for reviewer)

• Ensure utility / function has a test case
• Ensure all the tests are passing

Type of change

• Bug fix
• New feature
• Update feature
• Refactor code
• Translation to code
• Translation to crowdin
• Script configuration
• Improve performance
• Style only
• Dependency update
• Documentation update
• Release

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🔍 Inspect: https://vercel.com/deriv/deriv-app/EnL8Y41BH6HUmx9BhtqC3emaweR4
✅ Preview: https://deriv-app-git-fork-adrienne-deriv-task-60652-floating-po-c852dd.binary.sx

[github-actions]

A production App ID was automatically generated for this PR. (log)

• PR: Adrienne/Fixed floating-point notations on buy/sell ads input amount #5168
• URLs:
  • w/ App ID + Server: https://deriv-app-git-fork-adrienne-deriv-task-60652-floating-po-c852dd.binary.sx?qa_server=frontend.binaryws.com&app_id=24186
  • Original: https://deriv-app-git-fork-adrienne-deriv-task-60652-floating-po-c852dd.binary.sx
• App ID: 24186

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- **PR**: [https://github.com/binary-com/deriv-app/pull/5168](https://github.com/binary-com/deriv-app/pull/5168)
- **URLs**:
    - **w/ App ID + Server**: https://deriv-app-git-fork-adrienne-deriv-task-60652-floating-po-c852dd.binary.sx?qa_server=frontend.binaryws.com&app_id=24186
    - **Original**: https://deriv-app-git-fork-adrienne-deriv-task-60652-floating-po-c852dd.binary.sx
- **App ID**: `24186`

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Name	Status	Preview	Updated
deriv-app	✅ Ready (Inspect)	Visit Preview	Apr 28, 2022 at 8:05AM (UTC)

[sonarcloud]

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2.0% Duplication