Adds
[eslint-plugin-vue-scoped-css](https://github.com/future-architect/eslint-plugin-vue-scoped-css)
and fixes discovered issues which are:
- 1 unused selector
- 3 selectors with `.full.height` parent in a `<style scoped>` block so
the rule could not find the parent. Move these into the unscoped block
instead. They worked before and after.
I found that some lint warnings in my editor are conflicting, and I
believe the root cause is using lints designed for Vue 2 instead of Vue
3. We moved to Vue 3 in #20044.
I verified that the explicitly disabled rules in the changed file are
still part of the `vue/vue3-recommended` set.
See [Available rules -
eslint-plugin-vue](https://eslint.vuejs.org/rules/) for a full list of
lints.
Introduce a separate .eslintrc in the Vue components folder to
selectively enable vue-eslint-parser there, so that the rest of the
files can use eslint's core parser which can deal with hashbangs.
The fact that the eslint-disable comments worked in HTML was a
unintended side-effect of the files being parsed via vue-eslint-parser,
so I had to disable the parsing of these files in .eslintrc.yaml to make
it work, and finally decided to remove eslint-plugin-html as it causes
more issues than it solves.
