Remove Secure Backup, Cross-signing and Cryptography sections in Security & Privacy user settings (#29088)

* feat(security tab)!: remove secure backup panel

BREAKING CHANGE: the key storage user interaction are moved into the Encryption tab. The debugging information are moved into the devtools.

* feat(security tab)!: remove cross signing section

BREAKING CHANGE: the cryptographic identity can be reseted in the Encryption tab. The debugging information are moved into the devtools

* feat(security tab)!: remove cryptography section

BREAKING CHANGE: this section can be found in the Advanced section of the encryption tab.

* test(security tab): update snapshot

* chore(security tab): remove unused component and function

* chore(security tab): update i18n

* test(e2e): remove `backups.spec.ts`

res/css/_components.pcss

@@ -340,8 +340,6 @@
 @import "./views/rooms/wysiwyg_composer/components/_FormattingButtons.pcss";
 @import "./views/rooms/wysiwyg_composer/components/_LinkModal.pcss";
 @import "./views/settings/_AvatarSetting.pcss";
-@import "./views/settings/_CrossSigningPanel.pcss";
-@import "./views/settings/_CryptographyPanel.pcss";
 @import "./views/settings/_FontScalingPanel.pcss";
 @import "./views/settings/_ImageSizePanel.pcss";
 @import "./views/settings/_IntegrationManager.pcss";
@@ -354,7 +352,6 @@
 @import "./views/settings/_PhoneNumbers.pcss";
 @import "./views/settings/_PowerLevelSelector.pcss";
 @import "./views/settings/_RoomProfileSettings.pcss";
-@import "./views/settings/_SecureBackupPanel.pcss";
 @import "./views/settings/_SetIntegrationManager.pcss";
 @import "./views/settings/_SettingsFieldset.pcss";
 @import "./views/settings/_SettingsHeader.pcss";

res/css/views/settings/_CrossSigningPanel.pcss

@@ -1,36 +0,0 @@
-/*
-Copyright 2024 New Vector Ltd.
-Copyright 2019 The Matrix.org Foundation C.I.C.
-
-SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
-Please see LICENSE files in the repository root for full details.
-*/
-
-.mx_CrossSigningPanel_statusList {
-    border-spacing: 0;
-
-    th {
-        text-align: start;
-    }
-
-    td,
-    th {
-        padding: 0;
-
-        &:first-of-type {
-            padding-inline-end: 1em;
-        }
-    }
-}
-
-.mx_CrossSigningPanel_buttonRow {
-    margin: 1em 0;
-
-    :nth-child(n + 1) {
-        margin-inline-end: 10px;
-    }
-}
-
-.mx_CrossSigningPanel_advanced {
-    width: fit-content;
-}

res/css/views/settings/_CryptographyPanel.pcss

@@ -1,32 +0,0 @@
-/*
-Copyright 2024 New Vector Ltd.
-Copyright 2023 The Matrix.org Foundation C.I.C.
-
-SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
-Please see LICENSE files in the repository root for full details.
-*/
-
-.mx_CryptographyPanel_sessionInfo {
-    padding: 0em;
-    border-spacing: 0px;
-}
-.mx_CryptographyPanel_sessionInfo > tr {
-    vertical-align: baseline;
-    padding: 0em;
-
-    th {
-        text-align: start;
-    }
-
-    td,
-    th {
-        padding: 0 1em 0 0;
-    }
-}
-
-.mx_CryptographyPanel_importExportButtons {
-    display: inline-flex;
-    flex-flow: wrap;
-    row-gap: $spacing-8;
-    column-gap: $spacing-8;
-}

res/css/views/settings/_SecureBackupPanel.pcss

@@ -1,44 +0,0 @@
-/*
-Copyright 2024 New Vector Ltd.
-Copyright 2019, 2020 The Matrix.org Foundation C.I.C.
-Copyright 2018 New Vector Ltd
-
-SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
-Please see LICENSE files in the repository root for full details.
-*/
-
-.mx_SecureBackupPanel_deviceName {
-    font-style: italic;
-}
-
-.mx_SecureBackupPanel_buttonRow {
-    margin: 1em 0;
-    display: inline-flex;
-    flex-flow: wrap;
-    row-gap: 10px;
-
-    :nth-child(n + 1) {
-        margin-inline-end: 10px;
-    }
-}
-
-.mx_SecureBackupPanel_statusList {
-    border-spacing: 0;
-
-    th {
-        text-align: start;
-    }
-
-    td,
-    th {
-        padding: 0;
-
-        &:first-of-type {
-            padding-inline-end: 1em;
-        }
-    }
-}
-
-.mx_SecureBackupPanel_advanced {
-    width: fit-content;
-}