Use navigator.clipboard once TypeScript will support it

[maciaszczykm]

Workaround introduced in #798:
https://github.com/kubermatic/dashboard-v2/pull/798/files#diff-61e9885f1b235bb377293ac564650cd7R82

Use navigator.clipboard instead of navigator['clipboard'] once TypeScript will support it:
microsoft/TypeScript#26728 (comment)

[maciaszczykm]

It is already on master:
https://github.com/Microsoft/TypeScript/blob/2f9218f/src/lib/dom.generated.d.ts#L10489

But we cannot use it yet. Version doesn't match Angular yet.

[maciaszczykm]

Added in: microsoft/TypeScript#29690

[maciaszczykm]

Angular version is still blocking this. We need TypeScript >v3.4.1 and Angular requires <v3.2.0.