Remove the force variant (tailwindlabs#16007)

This PR will remove the `force` variant. This was an experiment that we
accidentally shipped, but there is no documentation nor is there any
intellisense autocompletion for it.

Author: RobinMalfait

packages/tailwindcss/src/__snapshots__/intellisense.test.ts.snap

@@ -7504,13 +7504,6 @@ exports[`getClassList 1`] = `
 
 exports[`getVariants 1`] = `
 [
-  {
-    "hasDash": true,
-    "isArbitrary": false,
-    "name": "force",
-    "selectors": [Function],
-    "values": [],
-  },
   {
     "hasDash": true,
     "isArbitrary": false,

packages/tailwindcss/src/variants.test.ts

@@ -6,15 +6,6 @@ import { Compounds, compoundsForSelectors } from './variants'
 
 const css = String.raw
 
-test('force', async () => {
-  expect(await run(['force:flex'])).toMatchInlineSnapshot(`
-    ".force\\:flex {
-      display: flex;
-    }"
-  `)
-  expect(await run(['force/foo:flex'])).toEqual('')
-})
-
 test('*', async () => {
   expect(await run(['*:flex'])).toMatchInlineSnapshot(`
     ":is(.\\*\\:flex > *) {

packages/tailwindcss/src/variants.ts

@@ -365,7 +365,6 @@ export function createVariants(theme: Theme): Variants {
     )
   }
 
-  variants.static('force', () => {}, { compounds: Compounds.Never })
   staticVariant('*', [':is(& > *)'], { compounds: Compounds.Never })
   staticVariant('**', [':is(& *)'], { compounds: Compounds.Never })