Fix login uiautomator flakiness

[Rawa]

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This change is 

[linear]

DROID-405 Login tests fail on CI

https://github.com/mullvad/mullvadvpn-app/actions/runs/6458123698/job/17531743437?pr=5253

INSTRUMENTATION_STATUS: numtests=3
INSTRUMENTATION_STATUS: stream=
INSTRUMENTATION_STATUS: test=testLoginWithInvalidCredentials
INSTRUMENTATION_STATUS_CODE: 1
INSTRUMENTATION_STATUS: class=net.mullvad.mullvadvpn.test.mockapi.LoginMockApiTest
INSTRUMENTATION_STATUS: current=3
INSTRUMENTATION_STATUS: id=AndroidJUnitRunner
INSTRUMENTATION_STATUS: numtests=3
INSTRUMENTATION_STATUS: stack=java.lang.IllegalArgumentException: No matches for selector within timeout (60000): BySelector [TEXT='\QLogin failed\E']
	at net.mullvad.mullvadvpn.test.common.extension.UiAutomatorExtensionsKt.findObjectWithTimeout(UiAutomatorExtensions.kt:30)
	at net.mullvad.mullvadvpn.test.mockapi.LoginMockApiTest.testLoginWithInvalidCredentials(LoginMockApiTest.kt:32)

INSTRUMENTATION_STATUS: stream=
Error in testLoginWithInvalidCredentials(net.mullvad.mullvadvpn.test.mockapi.LoginMockApiTest):
java.lang.IllegalArgumentException: No matches for selector within timeout (60000): BySelector [TEXT='\QLogin failed\E']
	at net.mullvad.mullvadvpn.test.common.extension.UiAutomatorExtensionsKt.findObjectWithTimeout(UiAutomatorExtensions.kt:30)
	at net.mullvad.mullvadvpn.test.mockapi.LoginMockApiTest.testLoginWithInvalidCredentials(LoginMockApiTest.kt:32)

INSTRUMENTATION_STATUS: test=testLoginWithInvalidCredentials
INSTRUMENTATION_STATUS_CODE: -2
INSTRUMENTATION_RESULT: stream=

Time: 105.573
There was 1 failure:
1) testLoginWithInvalidCredentials(net.mullvad.mullvadvpn.test.mockapi.LoginMockApiTest)
java.lang.IllegalArgumentException: No matches for selector within timeout (60000): BySelector [TEXT='\QLogin failed\E']
	at net.mullvad.mullvadvpn.test.common.extension.UiAutomatorExtensionsKt.findObjectWithTimeout(UiAutomatorExtensions.kt:30)
	at net.mullvad.mullvadvpn.test.mockapi.LoginMockApiTest.testLoginWithInvalidCredentials(LoginMockApiTest.kt:32)

FAILURES!!!

[albin-mullvad]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved