[REF] survey: improve existing answer management in invite wizard

Purpose of this merge is to clean the way we manage exiting answer when
inviting partners or emails to participate to a survey.

When wizard finds that some recipients are already linked to answers it
displays a bootstrap warning with the name of duplicate recipients and
display the field allowing to choose between two options

 * resend: send the same token and answer;
 * new: create a new token and answer;

It will be useful notably with certifications support as number of attempts
to succeed is limited. Allowing people to retake certifications should be
made clear to survey managers.

This commit is linked to task ID 1935176 and PR #30689 .

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