Component: The Rest of the PrimeVue buttons (#7649)

## Summary

Automated initial change, cleaned up manually.

Please check the screenshot changes.

Includes a11y updates to icon buttons.

Doesn't hit the buttons in Desktop.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7649-WIP-Component-The-Rest-of-the-PrimeVue-buttons-2ce6d73d365081d68e06f200f1321267)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

src/platform/cloud/onboarding/components/CloudSignInForm.vue

@@ -67,10 +67,11 @@
     <Button
       v-else
       type="submit"
-      :label="t('auth.login.loginButton')"
       class="mt-4 h-10 font-medium text-white"
       :disabled="!$form.valid"
-    />
+    >
+      {{ t('auth.login.loginButton') }}
+    </Button>
   </Form>
 </template>
 
@@ -78,7 +79,6 @@
 import type { FormSubmitEvent } from '@primevue/forms'
 import { Form } from '@primevue/forms'
 import { zodResolver } from '@primevue/forms/resolvers/zod'
-import Button from 'primevue/button'
 import InputText from 'primevue/inputtext'
 import Message from 'primevue/message'
 import Password from 'primevue/password'
@@ -86,6 +86,7 @@ import ProgressSpinner from 'primevue/progressspinner'
 import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 
+import Button from '@/components/ui/button/Button.vue'
 import { signInSchema } from '@/schemas/signInSchema'
 import type { SignInData } from '@/schemas/signInSchema'
 import { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'

src/platform/cloud/onboarding/components/CloudTemplate.vue

@@ -49,7 +49,7 @@
             <Button
               type="button"
               class="h-10 bg-black font-bold text-white"
-              severity="secondary"
+              variant="secondary"
               @click="handleDownloadClick"
             >
               {{ t('cloudStart_download') }}
@@ -62,8 +62,7 @@
 </template>
 
 <script setup lang="ts">
-import Button from 'primevue/button'
-
+import Button from '@/components/ui/button/Button.vue'
 import { t } from '@/i18n'
 import videoPoster from '@/platform/cloud/onboarding/assets/videos/thumbnail.png'
 import videoSrc from '@/platform/cloud/onboarding/assets/videos/video.mp4'