fixing link can handle more than one @

[Shyam-Raghuwanshi]

• I signed and returned the Plone Contributor Agreement, and received and accepted an invitation to join a team in the Plone GitHub organization.
• I verified there aren't other open pull requests for the same change.
• I followed the guidelines in Contributing to Volto.
• I succesfully ran code linting checks on my changes locally.
• I succesfully ran unit tests on my changes locally.
• I succesfully ran acceptance tests on my changes locally.
• If needed, I added new tests for my changes.
• If needed, I added documentation for my changes, either in the Storybook or narrative documentation.
• I included a change log entry in my commits.

Closes #6448

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[stevepiercy]

@Shyam-Raghuwanshi please see https://6.docs.plone.org/contributing/first-time.html#work-with-github-issues, especially Items 2 and 3 in that list. It will save you some time, effort, and frustration.

There is no consensus yet on the correct regex or process to use for validating mailto URLs. That has to happen first, so I'm closing this PR. Nonetheless, this snippet from your PR would be useful examples to discuss in the original issue.

        'mailto:[email protected]',
        'mailto:[email protected],[email protected]',
        'mailto:[email protected][email protected]',
        'mailto:[email protected]?subject=Hello&body=World',