[new_profile] Fix datepicker default values.

[racostas]

Brief summary of changes

Fix the datapicker default values for the "Date of Birth" and "Date of Birth Confirm" fields. Updates the testPlan.

• Have you updated related documentation?

Testing instructions (if applicable)

1. Go to the Configuration module and change the "Minimum candidate age" value.
2. Now go to the new_profile module and make sure "Date of Birth" and "Date of Birth Confirm" fields
   properly reflects the changes.
3. Go again to the Configuration and now delete the value in the "Minimum candidate age" field, and save.
4. Now go to the new_profile module again make sure "Date of Birth" and "Date of Birth Confirm" fields have as the maximum possible value to choose the current day.

Link(s) to related issue(s)

• Resolves # (Reference the issue this fixes, if any.)

[CamilleBeau]

This should not be changed in all DateElements, but only set as the MaxYear for the date of birth element specifically.

[kongtiaowang]

LGTM

[driusan]

This can't be merged because it's marked as a draft..