UX: Add a class to enhance popover fluidity on hover

[louismaximepiton]

Note: Please transform - [ ] into - (NA) in the description when things are not applicable

Related issues

NA

Description

Adding .pe-none to the popovers.
Adding pointer-events: none !important to the popovers for angular at least.

Motivation & Context

It was quite unpleasant to browse the examples and moving the mouse towards the top of the page because it places the cursor over the popover and prevent new popovers to create.

Types of change

• Bug fix (non-breaking which fixes an issue)

Test checklist

Please check that the following tests projects are still working:

• docs/examples
• test/angular-ngx-echarts
• test/angular-tour-of-heroes
• test/html
• test/react
• test/vue
• test/examples/bar-line-chart
• test/examples/single-line-chart
• test/examples/timeseries-chart

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[julien-deramond]

Good catch! Modification really appreciated!
Tried it in the all examples and it works perfectly! LGTM