[Fix] Replace deprecated CSS 'push-button'. Adds type='button' to Custom Link Prompt.

[marclucraft]

Description

• Fixes warning in console: [Deprecation] The keyword 'push-button' specified to an 'appearance' property is not standardized. It will be removed in the future.
• Adds type="button" to the Custom Link Button. This prevents this button submitting if included in a form.

Details

Both long standing bugs.

Systems Affected

• WebSDK
• Backend
• Dashboard

Validation

Tests

Info

Checklist

• All the automated tests pass or I explained why that is not possible
• I have personally tested this on my machine or explained why that is not possible
• I have included test coverage for these changes or explained why they are not needed

Programming Checklist
Interfaces:

• Don't use default export
• New interfaces are in model files

Functions:

• Don't use default export
• All function signatures have return types
• Helpers should not access any data but rather be given the data to operate on.

Typescript:

• No Typescript warnings
• Avoid silencing null/undefined warnings with the exclamation point

Other:

• Iteration: refrain from using elem of array syntax. Prefer forEach or use map
• Avoid using global OneSignal accessor for context if possible. Instead, we can pass it to function/constructor so that we don't call OneSignal.context

Screenshots

Info

Checklist

• I have included screenshots/recordings of the intended results or explained why they are not needed

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Related Tickets

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This change is 

[jkasten2]

• Let's remove the comment about push-button since we are not using it anymore.
• Change PR title to what is being addressed
  • Details in the PR can include that they are long standing bugs.