[WNMGDS-2744] Make the web components bundle split backwards compatible

[pwolfert]

Summary

This is a follow-up to https://github.com/CMSgov/design-system/pull/3070 to make it backwards compatible so we can include it in a feature release.

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