feat: 🎸 Add rules to help migrating to Vue 3

feat: 🎸 Add rules to help migrating to Vue 3

Addresses #31 (closed), part of gitlab-org&3174 (closed).

BREAKING CHANGE: Several new rules are now enabled that prevent deprecated APIs from being used when there are reasonable alternatives available in Vue 2:

• vue/no-deprecated-data-object-declaration
• vue/no-deprecated-filter
• vue/no-deprecated-functional-template
• vue/no-deprecated-inline-template
• vue/no-deprecated-props-default-this
• vue/no-deprecated-scope-attribute
• vue/no-deprecated-slot-attribute
• vue/no-deprecated-slot-scope-attribute

See https://eslint.vuejs.org/rules/ for more detail about these rules.

Related

• Issue: #31 (closed)
• Integration MR for gitlab-org/gitlab: gitlab-org/gitlab!64780 (merged)
• MR against gitlab-org/gitlab to fix deprecated slot syntax usage: gitlab-org/gitlab!64604 (merged)