chore(scss): remove injected global styles (#26469)

this commit removes a globally injected style, `ionic.skip-warns.scss`,
from the project. this stylesheet was used to set a variable, `$Ionic`,
that would turn on/off deprecation warnings in (the also removed)
`ionic.deprecation.scss`. any file using either of the aforementioned
files have been updated.

this change is occurring while the stencil team is looking to improve
the size of generated components that use >1 mode. this deprecation was
a part of an initiative to remove sass source files from artifact
published to npm. while that was completed, this deprecation was not
removed (until now)

Co-authored-by: Liam DeBeasi <liamdebeasi@users.noreply.github.com>

core/src/css/core.scss

@@ -1,4 +1,3 @@
-@import "../themes/ionic.skip-warns.scss";
 @import "../themes/ionic.globals";
 @import "../components/menu/menu.ios.vars";
 @import "../components/menu/menu.md.vars";

core/src/css/display.scss

@@ -1,4 +1,3 @@
-@import "../themes/ionic.skip-warns.scss";
 @import "../themes/ionic.globals";
 @import "../themes/ionic.mixins";
 

core/src/css/float-elements.scss

@@ -1,4 +1,3 @@
-@import "../themes/ionic.skip-warns.scss";
 @import "../themes/ionic.globals";
 @import "../themes/ionic.mixins";
 

core/src/css/ionic-swiper.scss

@@ -1,4 +1,3 @@
-@import "../themes/ionic.skip-warns.scss";
 @import "../components/slides/slides.ios.vars.scss";
 
 // Slides

core/src/css/padding.scss

@@ -1,4 +1,3 @@
-@import "../themes/ionic.skip-warns.scss";
 @import "../themes/ionic.globals";
 @import "../themes/ionic.mixins";
 

core/src/css/structure.scss

@@ -1,4 +1,3 @@
-@import "../themes/ionic.skip-warns.scss";
 @import "../themes/ionic.globals";
 @import "../themes/ionic.mixins";
 

core/src/css/text-alignment.scss

@@ -1,4 +1,3 @@
-@import "../themes/ionic.skip-warns.scss";
 @import "../themes/ionic.globals";
 @import "../themes/ionic.mixins";
 

core/src/css/text-transformation.scss

@@ -1,4 +1,3 @@
-@import "../themes/ionic.skip-warns.scss";
 @import "../themes/ionic.globals";
 @import "../themes/ionic.mixins";
 

core/src/css/typography.scss

@@ -1,4 +1,3 @@
-@import "../themes/ionic.skip-warns.scss";
 @import "../themes/ionic.globals";
 @import "../themes/ionic.mixins";
 

core/src/themes/ionic.deprecation.scss

@@ -1,5 +0,0 @@
-$IONIC: false !default;
-
-@if not $IONIC {
-  @warn "[DEPRECATED] SCSS within ionic/core should not be imported. Next major release will remove all scss support.";
-}

core/src/themes/ionic.functions.color.scss

@@ -1,5 +1,3 @@
-@import "./ionic.deprecation";
-
 // Gets the active color's css variable from a variation. Alpha is optional.
 // --------------------------------------------------------------------------------------------
 // Example usage:

core/src/themes/ionic.functions.string.scss

@@ -1,5 +1,3 @@
-@import "./ionic.deprecation";
-
 // String Utility Functions
 // --------------------------------------------------------------------------------
 

core/src/themes/ionic.mixins.scss

@@ -1,5 +1,3 @@
-@import "./ionic.deprecation";
-
 @mixin input-cover() {
   @include position(0, null, null, 0);
   @include margin(0);

core/src/themes/ionic.skip-warns.scss

@@ -1 +0,0 @@
-$IONIC: true;

core/src/themes/ionic.theme.default.scss

@@ -1,5 +1,3 @@
-@import "./ionic.deprecation";
-
 // Ionic Theme
 // -------------------------------------------------------------------------------------------
 // This file contains the theme variables shared

core/stencil.config.ts

@@ -58,9 +58,7 @@ export const config: Config = {
     { components: ['ion-breadcrumb', 'ion-breadcrumbs'] },
   ],
   plugins: [
-    sass({
-      injectGlobalPaths: ['src/themes/ionic.skip-warns.scss']
-    })
+    sass(),
   ],
   outputTargets: [
     reactOutputTarget({