Add custom remove label option to Tag component

[justinwolfe]

Problem/Feature

In the beautiful CC/BCC implementation that @plbabin did for the mailbox rewrite, we're using the Tag component as a badge to represent the email address. During accessibility review, we found it would be best to be able to customize the label, since it reads "Remove Tag" but in this context there isn't a tag. This adds a prop to be able to set the aria-label and test ID of the removal element to a different value:

Guidelines

Make sure the pull request:

• [x] Follows the established folder/file structure
• [ ] Adds unit tests
• [ ] If it is a refactor or change to an existing component, have you verified it won't break existing Cypress tests or have you updated them?
• [x] Did you verify some accessibility (a11y) basics?
• [x] Adds/updates stories. Guidelines
• [x] Adds/updates documentation (ie proptypes) Guidelines
• [ ] Has it been tested in Help Scout's supported browsers?
• [ ] Requests review from designer of the feature
• [ ] Add label (bug? feature?)

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[justinwolfe]

@plbabin had the great idea, rather than just passing a custom label, to pass in a removeProps object so that we could have flexibility to pass additional props, so I've switched to that!