[WNMGDS-2861] Adds Email, Link, RSS & What's New Icon components

[tamara-corbalt]

Summary

Adds four new icon components:

• EmailIcon
• LinkIcon
• RssIcon
• WhatsNewIcon

See Jira ticket for details: WNMGDS-2861. Please note that a Download icon has already been added to the codebase.

How to test

1. Run yarn storybook.
2. Navigate to the Icons section and verify the presence and appearance of the new icons.

Checklist

• [X] Prefixed the PR title with the Jira ticket number as [WNMGDS-####] Title or [NO-TICKET] if this is unticketed work.
• [X] Selected appropriate Type (only one) label for this PR, if it is a breaking change, label should only be Type: Breaking
• [X] Selected appropriate Impacts, multiple can be selected.
• [X] Selected appropriate release milestone

[tamara-corbalt]

@jack-ryan-nava-pbc I like the idea of supporting viewBox controls because it gives Storybook users the flexibility to customize the icons. However, I'm concerned about the added complexity to our Storybook configuration and the potential for misuse. Could changing the proportions of the icons potentially distort the layout of the icon table?