fix(material/autocomplete): allow overlay backdrop by setting hasBackdrop option

[mistrykaran91]

Currently when we open the panel, backdrop is not allowed and is not inline with mat-select, mat-menu, etc. This fix will align autocomplete with those components and give an option to configure it.

Fixes #30457

[mistrykaran91]

@crisbeto : Seems action:merge label was removed and not added after the later approval or it will be added later ?

[crisbeto]

I'll add it before merging the change in.

[bumsimausi]

I didn't verify this, but I am currently experiencing issues as described in #26484 and seem to be resolved when the backdrop is added.

I believe this would also fix #26484 and #30416?

As I've seen this is not added to a 19.x.x but to https://github.com/angular/components/releases/tag/20.0.0-next.2

Would it be possible to pick this also into a 19.x.x release?

[bumsimausi]

I didn't verify this, but I am currently experiencing issues as described in #26484 and seem to be resolved when the backdrop is added.

I believe this would also fix #26484 and #30416?

As I've seen this is not added to a 19.x.x but to https://github.com/angular/components/releases/tag/20.0.0-next.2

Would it be possible to pick this also into a 19.x.x release?

@crisbeto maybe you can help me with that?

[crisbeto]

Will be cherry-picked by #30715.

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