fix(material/table): move unthemable tokens to theme mixin

Though these tokens are not currently affected by the theme, in the
future they will be affected by the design system used for theming (M2
or M3)

BREAKING CHANGE:
There are new styles emitted by mat.table-theme that are not
emitted by any of: mat.table-color, mat.table-typography,
mat.table-density. If you rely on the partial mixins only and don't
call mat.table-theme, you can add mat.table-base to get the
missing styles.

src/material/_index.scss

@@ -127,7 +127,7 @@ list-density, list-base;
 @forward './stepper/stepper-theme' as stepper-* show stepper-theme, stepper-color,
   stepper-typography, stepper-density;
 @forward './table/table-theme' as table-* show table-theme, table-color, table-typography,
-  table-density;
+  table-density, table-base;
 @forward './tabs/tabs-theme' as tabs-* show tabs-theme, tabs-color, tabs-typography, tabs-density;
 @forward './toolbar/toolbar-theme' as toolbar-* show toolbar-theme, toolbar-color,
   toolbar-typography, toolbar-density;

src/material/table/_table-theme.scss

@@ -3,41 +3,39 @@
 @use '../core/theming/inspection';
 @use '../core/typography/typography';
 @use '../core/tokens/token-utils';
+@use '../core/style/sass-utils';
 
-@mixin _output-tokens {
-  @if (&) {
-    @content;
-  }
-  @else {
-    html {
-      @content;
-    }
+@mixin base($theme) {
+  @include sass-utils.current-selector-or-root() {
+    @include token-utils.create-token-values(
+        tokens-mat-table.$prefix, tokens-mat-table.get-unthemable-tokens());
   }
 }
 
 @mixin color($theme) {
-  @include _output-tokens {
+  @include sass-utils.current-selector-or-root() {
     @include token-utils.create-token-values(tokens-mat-table.$prefix,
       tokens-mat-table.get-color-tokens($theme));
   }
 }
 
 @mixin typography($theme) {
-  @include _output-tokens {
+  @include sass-utils.current-selector-or-root() {
     @include token-utils.create-token-values(tokens-mat-table.$prefix,
       tokens-mat-table.get-typography-tokens($theme));
   }
 }
 
 @mixin density($theme) {
-  @include _output-tokens {
+  @include sass-utils.current-selector-or-root() {
     @include token-utils.create-token-values(tokens-mat-table.$prefix,
       tokens-mat-table.get-density-tokens($theme));
   }
 }
 
 @mixin theme($theme) {
   @include theming.private-check-duplicate-theme-styles($theme, 'mat-table') {
+    @include base($theme);
     @if inspection.theme-has($theme, color) {
       @include color($theme);
     }

src/material/table/table.scss

@@ -32,9 +32,6 @@
 @include table-flex-styles.private-table-flex-styles();
 
 .mat-mdc-table {
-  @include token-utils.create-token-values(
-    tokens-mat-table.$prefix, tokens-mat-table.get-unthemable-tokens());
-
   // MDC Table applies `table-layout: fixed`, but this is a backwards incompatible
   // change since the table did not previously apply it.
   // TODO: Add a mixin to MDC to set the layout instead of including this override,