Increase lifespan of renku-cli client's access token

[mohammad-alisafaee]

Renku-cli KC client application currently has an access token with a 30-minute lifespan, meaning that users have to login from CLI every 30 minutes.

The maximum possible lifespan for a token must be less than KC realm's max session expiration time (i.e. SSO Session Max) which is currently 7 days.

We should increase both of these timeout values to make a balance between usability (how frequently a user needs to login) and security.