fix(login): ignore select_account in case there aren't any session to choose

[livio-a]

Which Problems Are Solved

When poviding select_account in an OIDC auth request, ZITADEL would always show the account selection page even if there aren't any user sessions to choose and the user would then need to click the Other User button to be presented the login page.

How the Problems Are Solved

This PR changes the behavior and ignores the select_account prompt in case there aren't any existing user sessions and will directly present the login page.

Additional Changes

None

Additional Context

Closes #7213

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7981   +/-   ##
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  Coverage        ?   62.76%           
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  Files           ?     1341           
  Lines           ?   111033           
  Branches        ?        0           
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  Hits            ?    69691           
  Misses          ?    37418           
  Partials        ?     3924           

Flag	Coverage Δ
core-integration-tests-postgres	62.76% <100.00%> (?)

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🎉 This PR is included in version 2.53.0 🎉

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