Move shared components to a packages/ directory (#30962)

* Move shared components to a packages/ directory

so they can be publish more sensibly

* Iterate towards split out shared-components module

 * Move shared component source into src/ subdir
 * Fix up imports
 * Include shared components in babel-ing (again)

* Remove now unused dependencies

* Update import in storybook preview

* ...except of course they aren't unused

if we import the shared components by source

* Ignore shared components deps

* Add shared-components to i18n paths

and upgrade web-i18n to version that supports doing so

* Move storybook stuff to shared-components

* Seems we don't need this anymore...

* Remove unused deps

and remove storybook plugin from eslint

* Presumably working-directory is only valid on run steps

* Ignore dep & run prettier

* Prettier on knips.ts

* Hopefully run in right dir

* Remember how to software write

* Okay... how about THIS way?

* Oh right, they were git ignored. Sigh.

* Add concurrently

* Ignore in knip

* Better?

* Paaaaaaaackageeeeeeees

* More packages

* Move playwright snapshots

* Still need a custom snapshots dir

* Add eslint back

* Oh, now knip sees them

* Fix another import

* Don't lint shared-components with everything else

Okay, eslint & tsconfig are tied too closely for this to work and
running tsc on the shared components will need its deps installing

* Maybe lint shared components

please?

* Not quite

* Remove storybook again

Re-check if it does work without it

* Remove storybook eslint plugin

as we're not linting storybook here anymore

* Remove this too

* We do need it here though

.github/workflows/shared-component-visual-tests.yaml

@@ -31,10 +31,15 @@ jobs:
                   cache: "yarn"
                   node-version: "lts/*"
 
+            - name: Install element web dependencies
+              run: yarn install --frozen-lockfile
+
             - name: Install dependencies
+              working-directory: packages/shared-components
               run: yarn install --frozen-lockfile
 
             - name: Get installed Playwright version
+              working-directory: packages/shared-components
               id: playwright
               run: echo "version=$(yarn list --pattern @playwright/test --depth=0 --json --non-interactive --no-progress | jq -r '.data.trees[].name')" >> $GITHUB_OUTPUT
 
@@ -46,6 +51,7 @@ jobs:
                   key: ${{ runner.os }}-${{ runner.arch }}-playwright-${{ steps.playwright.outputs.version }}-onlyshell
 
             - name: Install Playwright browsers
+              working-directory: packages/shared-components
               if: steps.playwright-cache.outputs.cache-hit != 'true'
               run: "yarn playwright install --with-deps --only-shell"
 
@@ -56,15 +62,15 @@ jobs:
             - name: Build storybook dependencies
               # When the first test is ran, it will fail because the dependencies are not yet built.
               # This step is to ensure that the dependencies are built before running the tests.
-              run: "yarn test:storybook:ci"
+              run: "yarn --cwd packages/shared-components test:storybook:ci"
               continue-on-error: true
 
             - name: Run Visual tests
-              run: "yarn test:storybook:ci"
+              run: "yarn --cwd packages/shared-components test:storybook:ci"
 
             - name: Upload received images & diffs
               if: always()
               uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
               with:
                   name: received-images
-                  path: playwright/shared-component-received
+                  path: packages/shared-components/playwright/shared-component-received