feat: add landing page for confirmation data request

[rowiish]

PR Type

[ ] Bugfix [x] Feature [ ] Code style update (formatting, local variables) [ ] Refactoring (no functional changes, no API changes) [ ] Build-related changes [ ] CI-related changes [ ] Documentation content changes [ ] Application / infrastructure changes [ ] Other:

What Is the Current Behavior?

No handling for confirming a GDPR personal data request available.

Issue Number: Closes #76539

What Is the New Behavior?

Provides a landing page used by the GDPR request for requesting personal data email to confirm that the request was initiated by the user.

Does this PR Introduce a Breaking Change?

[ ] Yes [x] No

Other Information

Functionality requires ICM 7.10.38.13-LTS or higher

AB#78231