refactor(profile): drop extended-profile editing, keep right-panel display

Extended-profile fields (io.element.profile.*) are no longer edited in the
client, so remove the edit form and the dead code that came with it, keeping
only the read-only right-panel display (UserExtendedProfileInfo).

- Remove ExtendedProfileSettings (edit form) + its Settings integration and CSS
- Remove ExtendedProfileView (never-rendered, dead) + its CSS
- Inline the EXT_PROFILE_KEY_* constants into UserExtendedProfileInfo so it no
  longer depends on the deleted settings component
- Drop now-unused set/deleteExtendedProfileProperty from UserProfilesStore
- Prune dead settings|extended_profile_settings|* i18n keys (and the unused
  user_info.extended_profile header/not_provided keys) across all locales
- Regenerate _components.pcss
- Revert UserProfileSettings/AccountUserSettingsTab tests (+snapshot) to master,
  since their adaptations existed only for the removed edit form

apps/web/test/unit-tests/components/views/settings/UserProfileSettings-test.tsx

@@ -18,7 +18,6 @@ import { mkStubRoom, stubClient } from "../../../../test-utils";
 import { ToastContext, type ToastRack } from "../../../../../src/contexts/ToastContext";
 import { OwnProfileStore } from "../../../../../src/stores/OwnProfileStore";
 import MatrixClientContext from "../../../../../src/contexts/MatrixClientContext";
-import { SdkContextClass } from "../../../../../src/contexts/SDKContext";
 import Modal from "../../../../../src/Modal";
 
 interface MockedAvatarSettingProps {
@@ -87,9 +86,6 @@ describe("ProfileSettings", () => {
 
     beforeEach(() => {
         client = stubClient();
-        // HealthChat's ExtendedProfileSettings reads the global SdkContextClass.instance.userProfilesStore,
-        // which requires the singleton client to be set (it is, on login, in the real app).
-        SdkContextClass.instance.client = client;
         toastRack = {
             displayToast: jest.fn().mockReturnValue(jest.fn()),
         };

apps/web/test/unit-tests/components/views/settings/tabs/user/AccountUserSettingsTab-test.tsx

@@ -85,9 +85,6 @@ describe("<AccountUserSettingsTab />", () => {
 
         stores = new SdkContextClass();
         stores.client = mockClient;
-        // HealthChat's ExtendedProfileSettings (mounted via UserProfileSettings) reads the global
-        // SdkContextClass.instance.userProfilesStore, which requires the singleton client to be set.
-        SdkContextClass.instance.client = mockClient;
         // stub out this store completely to avoid mocking initialisation
         const mockOidcClientStore = {} as unknown as OidcClientStore;
         jest.spyOn(stores, "oidcClientStore", "get").mockReturnValue(mockOidcClientStore);

apps/web/test/unit-tests/components/views/settings/tabs/user/__snapshots__/AccountUserSettingsTab-test.tsx.snap

@@ -42,14 +42,14 @@ exports[`<AccountUserSettingsTab /> 3pids should display 3pid email addresses an
       >
         <input
           autocomplete="email"
-          id="mx_Field_113"
+          id="mx_Field_3"
           label="Email Address"
           placeholder="Email Address"
           type="text"
           value=""
         />
         <label
-          for="mx_Field_113"
+          for="mx_Field_3"
         >
           Email Address
         </label>
@@ -154,14 +154,14 @@ exports[`<AccountUserSettingsTab /> 3pids should display 3pid email addresses an
         </span>
         <input
           autocomplete="tel-national"
-          id="mx_Field_114"
+          id="mx_Field_4"
           label="Phone Number"
           placeholder="Phone Number"
           type="text"
           value=""
         />
         <label
-          for="mx_Field_114"
+          for="mx_Field_4"
         >
           Phone Number
         </label>