[Feature] Sanitize mail template inputs

[simonhir]

Relevant component

refarch-integrations

Problem description (optional)

Currently the mail template inputs are directly used and allow Cross-Site-Scripting attacks. Under DigiWF com.googlecode.owasp-java-html-sanitizer:owasp-java-html-sanitizer was used for that.

Desired solution

Add mail template input sanitization to prevent XSS attacks.

Considered alternatives (optional)

No response

Additional context (optional)

No response

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