NG 15 themes should match the legacy themes

[daileytj]

Describe the desired feature/functionality

After updating to NG15 and Angular Material v15, Angular Material components, and Brightlayer UI components should still look the same as they did on v14.

Additional Context (where / how would this be used)

Is this request related to a current issue?

etn-ccis/blui-angular-showcase-demo#303 (comment)

Suggested implementation details

[joebochill]

@daileytj is this something we need an issue for, or should it just be part of the acceptance criteria for the PR that is still open? I.e., are we going to accept that PR as-is and then take this issue to handle cleanup?

[daileytj]

@daileytj is this something we need an issue for, or should it just be part of the acceptance criteria for the PR that is still open? I.e., are we going to accept that PR as-is and then take this issue to handle cleanup?

The PR that is (was) open was a showcase-demo project. In order to fix these properly we will need updates to the theme so I wrote this issue to capture the work that still needs to be done before officially publishing.

[JeffGreiner-eaton]

I tried finding an open issue for this but didn't.
The .cdk-overlay-backdrop-showing.blui-user-menu-bottomsheet-backdrop is getting trumped by .blui-blue .cdk-overlay-backdrop.cdk-overlay-backdrop-showing and setting opacity to 1 but instead should be .5 and displaying a solid background