removing auto selection of certificate type. In exchange, error message pops up right away on new application + other bug fixes

[SoLetsDev]

ECER-1013: Brief description of the changes

• Certificate form doesn't auto select a certification (ECER-1013)
• Bug fix where applicant could click back and forward to avoid form validation (ECER-812). Added a v-if on forms to ensure they get remounted each time we travel through the stepper.
• Updated wording for education checkbox (ECER-716)
• Alert box for duplicated character reference in work experience reference. ECER-1040
• Bug fix forms would fire off validation when switching between stepper. Showing error messages right away when we first arrive to the forms. (Had to do some setTimeout resetvalidation to prevent this jankiness.
• Bug fix character reference doesn't get cleared out when user removes first name, last name and email.

Checklist

• I have tested these changes locally.
• Changes to backend endpoints are covered by passing integration tests.
• I have added or updated the necessary documentation.

Screenshots
Alert Box and Error on preview page for work experience reference

[pcatkins]

See comments.