fix(multiple): enable hydration in autocomplete, menu and select (#28343)

Hydration was disabled for `mat-autocomplete`, `mat-menu` and `mat-select`, even though it currently seems to work. These changes enable it to allow for better initial performance.

Author: crisbeto

src/material/autocomplete/autocomplete.ts

@@ -114,7 +114,6 @@ export function MAT_AUTOCOMPLETE_DEFAULT_OPTIONS_FACTORY(): MatAutocompleteDefau
   exportAs: 'matAutocomplete',
   host: {
     'class': 'mat-mdc-autocomplete',
-    'ngSkipHydration': '',
   },
   providers: [{provide: MAT_OPTION_PARENT_COMPONENT, useExisting: MatAutocomplete}],
   animations: [panelAnimation],

src/material/menu/menu.ts

@@ -104,7 +104,6 @@ export function MAT_MENU_DEFAULT_OPTIONS_FACTORY(): MatMenuDefaultOptions {
     '[attr.aria-label]': 'null',
     '[attr.aria-labelledby]': 'null',
     '[attr.aria-describedby]': 'null',
-    'ngSkipHydration': '',
   },
   animations: [matMenuAnimations.transformMenu, matMenuAnimations.fadeInItems],
   providers: [{provide: MAT_MENU_PANEL, useExisting: MatMenu}],

src/material/select/select.ts

@@ -233,7 +233,6 @@ const _MatSelectMixinBase = mixinDisableRipple(
     '[attr.aria-disabled]': 'disabled.toString()',
     '[attr.aria-invalid]': 'errorState',
     '[attr.aria-activedescendant]': '_getAriaActiveDescendant()',
-    'ngSkipHydration': '',
     '[class.mat-mdc-select-disabled]': 'disabled',
     '[class.mat-mdc-select-invalid]': 'errorState',
     '[class.mat-mdc-select-required]': 'required',