Update OidcClient to accept String expires_in values

[sberyozkin]

Fixes #18374

Standard expires_in value is a JSON number (long) however some providers may return it as JSON String. This PR, instead of immediately retrieving it as Long, casts it to Long if the property is an instance of Long otherwise converts a String representation to Long.

One of the oidc_client_wiremock tests has been updated to check it (there is another test there which deals with Long)

CC @chiragrp

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[sberyozkin]

Thanks @gastaldi, it should be most optimal, the way you have proposed

[geoand]

Thanks!

[sberyozkin]

Thanks @geoand

[sberyozkin]

Thanks @gastaldi