[BUG] Collapsible nav quickly reopens when clicking the trigger buttin

[AMoo-Miki]

After the EUI bump, the nav trigger button quickly closes and opens the collapsible nav.

Before EUI bump:

After EUI bump:

This odd behavior is due to the outsideClickCloses of EuiFlyout, passed by EuiCollapsibleNav, firing before the click handler of the button and resulting in closing and reopening; outsideClickCloses defaults to true on EuiCollapsibleNav. Setting the prop to false appears to solve the problem.