Remove callout and replace with help text for personal access tokens

Problem to solve

A callout is presented to the user when the maximum lifetime of an access token is set, which does not conform to Pajamas.

Proposal

• Restrict the datepicker from allowing a user to pick a date later than the maximum life
• Replace the callout with a description field
  • Add 1 day to maximum lifetime count, for example a user can create an access token for 2022-01-12

Before	After no expiration	After with expiration enforcement

Implementation plan

• Create a parseExpiresAtFieldData util in app/assets/javascripts/access_tokens/utils.js and ee/app/assets/javascripts/access_tokens/utils.js. Use that util in app/assets/javascripts/access_tokens/index.js#L19
• Create a _expires_at_field.html.haml partial in app/views/shared/access_tokens and ee/app/views/shared/access_tokens. Add app/views/shared/access_tokens/_form.html.haml#L32 to these partials.
• Pass the value of the max_personal_access_token_lifetime to mount element in ee/app/views/shared/access_tokens
• Inject maxDate into app/assets/javascripts/access_tokens/components/expires_at_field.vue.
• Pass maxDate as a prop to GlDatepicker