pf: Adjust style of several PF overrides
pf: Adjust style of several PF overrides

- Fix several widgets for Composer
  - kebab
  - input group dropdowns
  - pagination
- Add blue line to top of tabs
- Change dropdown menus hover/focus to PF4 grey
- Fixup nav line
- Fix default button border color

Closes #12211
Addresses most of #12210

cockpituous/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpituous/cockpit,garrett/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,martinpitt/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpit-project/cockpit,deryni/cockpit,deryni/cockpit,cockpit-project/cockpit,garrett/cockpit,garrett/cockpit,garrett/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,garrett/cockpit,mvollmer/cockpit,deryni/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,deryni/cockpit,deryni/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,martinpitt/cockpit