(e2e) adding mobile e2e tests (#1521)

packages/desktop-client/e2e/mobile.test.js

...ges/desktop-client/e2e/page-models/mobile-account-page.js

...es/desktop-client/e2e/page-models/mobile-accounts-page.js

...ages/desktop-client/e2e/page-models/mobile-budget-page.js

packages/desktop-client/e2e/page-models/mobile-navigation.js

...p-client/e2e/page-models/mobile-transaction-entry-page.js

...op-client/src/components/accounts/MobileAccountDetails.js

.../desktop-client/src/components/accounts/MobileAccounts.js

...desktop-client/src/components/budget/MobileBudgetTable.js

packages/desktop-client/src/components/common/Button.tsx

packages/desktop-client/src/components/common/ButtonLink.tsx

packages/desktop-client/src/components/mobile/MobileForms.js

...s/desktop-client/src/components/spreadsheet/CellValue.tsx

...p-client/src/components/transactions/MobileTransaction.js

upcoming-release-notes/1521.md