fix(pf5): allow menu footer to be sticky and use danger style for delete/clear buttons

[tthvo]

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Related to #1303

Description of the change:

• Set maxMenuHeight and isScrollable where applicable.
• Menu-related changes:
  • Added a workaround to allow the menu footer to be sticky.
  • Updated the footer's action button styles to use 'secondary' and 'link'. Follow this guideline: https://www.patternfly.org/components/button/design-guidelines#link-button
  • For Delete action, use "danger" style, following this guideline: https://www.patternfly.org/components/menus/menu/design-guidelines#red-text-menu

Motivation for the change:

Previously, in order to view the action buttons at the menu footer, the user has to scroll all the way down. With these changes, the footer is always visible (i.e. sticky).

Ideally, the search bar should also be sticky. However, it does look like it is intended for the search bar to also scroll. See references:

• Patternfly issue: Context selector menu - use instant filtering and sticky search bar patternfly/patternfly-react#9801
• OpenShift console: Looks like the project selector also lets the search bar scroll with the list. Footer is sticky though.

Screenshots

Description	Screenshots
Sticky footer
Danger-styled Delete/Clear Buttons (example from Rule table)