feat(topbar): sanitize importUrl input

[tim-lai]

Description

• Add @braintree/sanitize-url@6.x
• For TopBar's ImportUrl method, sanitize user input of url before making a (axios) fetch request
• Handle error case if provided url is not a string, or is an empty string.
• In the event a fetch error occurs, the resulting error message also contains the sanitized url.

Motivation and Context

html safety.

How Has This Been Tested?

local

Screenshots (if appropriate):

Checklist

My PR contains...

• No code changes (src/ is unmodified: changes to documentation, CI, metadata, etc.)
• Dependency changes (any modification to dependencies in package.json)
• Bug fixes (non-breaking change which fixes an issue)
• Improvements (misc. changes to existing features)
• Features (non-breaking change which adds functionality)

My changes...

• are breaking changes to a public API (config options, System API, major UI change, etc).
• are breaking changes to a private API (Redux, component props, utility functions, etc.).
• are breaking changes to a developer API (npm script behavior changes, new dev system dependencies, etc).
• are not breaking changes.

Documentation

• My changes do not require a change to the project documentation.
• My changes require a change to the project documentation.
• If yes to above: I have updated the documentation accordingly.

Automated tests

• My changes can not or do not need to be tested.
• My changes can and should be tested by unit and/or integration tests.
• If yes to above: I have added tests to cover my changes.
• If yes to above: I have taken care to cover edge cases in my tests.
• All new and existing tests passed.

[swagger-bot]

🎉 This PR is included in version 5.0.0-alpha.13 🎉

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

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