Feature: add duration to application settings

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What does this MR do and why?

fixes #377654

feat: set id token expiration to access token expiration

Signed-off-by: Henry Sachs Henry.Sachs@deutschebahn.com

after !172049 (closed) failed

@jocelynjane @shampton @iamricecake

References

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Screenshots or screen recordings

How to set up and validate locally

• Start GitLab
• Go to Admin Settings
• Go to Preferences
• Set OIDC Timeout
• restart GitLab
• Create an OIDC Client via Applications
• set up local OIDC Tester (for example: https://github.com/auth0/openidconnect-playground) and have a look at the JWT Token Expiration