fix(DrawerPanelContent): add inert when drawer is closed

[logonoff]

What: Closes #11938

Have not tested this against OCP but this fixes the core issue where the drawer panel content still takes up width even when closed.

After this PR, the panel content is still "display"ed but now takes up width 0.

We cannot use display: none here as that breaks the drawer opening animation

Additional issues:

[rebeccaalpert]

It looks like the drawerresize.spec.ts integration test is failing - would you mind taking a look?

[patternfly-build]

Preview: https://pf-react-pr-12027.surge.sh

A11y report: https://pf-react-pr-12027-a11y.surge.sh

[logonoff]

@mcoker, I've updated the PR to just add the inert attribute when the drawer is closed.

It's unclear to me whether this will fix the issue I was having in OCP without running the end to end tests in an updated version of PatternFly. However, as you mentioned, we should have this attribute anyway so I think it's worth adding.

We can close the linked issue upon merging, and I'll reopen the issue if the problem continues to happen.

[mcoker]

LGTM testing the examples/demos!

[thatblindgeye]

Could we try adding a couple tests, one to check that inert is applied when isExpanded from the DrawerContext is false, and one to check that inert isn't applied when the isExpanded context is true?