[Monitor Management] Monitor Type drop down not selectable by mouse in Firefox

[paulb-elastic]

Using the main branch (so, what will be 8.1.0).

When using Firefox and attempting to select the type of monitor (TCP, ICMP etc.) from the Monitor Management, Add Monitor page, I cannot select anything with the mouse, as it remains on the default HTTP selection. The only way I can select it, is to use the keyboard to scroll down and then press enter.

https://user-images.githubusercontent.com/70908889/151352177-4bb619fb-36b7-4cbb-a7f0-78a2973fedd7.mp4

Notes:

• This only happens in Firefox (I’m using version 95), it is working correctly in Chrome
• That this problem does NOT happen on the Integration UI, only on Monitor Management UI

Steps to reproduce:

• Using Firefox
  • Go to Uptime
  • Select Monitor management
  • Select Add monitor
  • Type a Monitor name
  • Select a Monitor location
  • Use the mouse to try and pick something other than HTTP from the Monitor Type drop down, and you cannot

[awahab07]

Should be fixed with #445

[paulb-elastic]

@awahab07 just cross referencing a comment to the drop down here, with the referenced PR: https://github.com/elastic/kibana/pull/125017#issuecomment-1033694893