style(NcSelect): restrict max-height to prevent overflow by component

[Antreesy]

☑️ Resolves

• Fix cases then component could overflow page content (in sidebar, for example)
  • Restrict max-height of 'dropdown-toggle' element to 100px (2 visible lines of tags + 1 half-visible to scroll)
  • Make action button sticky to follow position

🖼️ Screenshots

🏚️ Before	🏡 After

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🚧 Tasks

• Check other use-cases
• Discuss restriction size

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 3️⃣ Backport to next requested with a Vue 3 upgrade

[ShGKme]

Nice. I'd do it even smaller by default, e.g. 2.5 lines.

[ShGKme]

Probably we need a different component to handle it. Something like GitHub's label dialog where you can search.

[jancborchardt]

Great idea! Agree with @ShGKme that a height of 2.5 lines would be nicer.

[Antreesy]

UPD: reduce max-height to 100px (2.5 - 2.6 visible lines)

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Github-styled labels is a good idea, but it's more a feature-level change (restyle of NcSelectTags wouldn't be enough, IMO), so I'd fix existing component first

[susnux]

/backport to next

[jancborchardt]

Thanks @Antreesy! :)