Portal ticket attachments

[wrongecho]

Allow contacts to upload attachments when adding ticket replies in portal

• Adds the ability for contacts to add file attachments when posting a ticket reply
• Enhancements to checkFileUpload(): Adjust file reference name generation & bad extension handling

[wrongecho]

Test these changes at: https://portalticketattachments784.pr-review.itflow.org
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[sonarcloud[bot]]

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8.0% Duplication