Prevent choosing invalid pat expiration date picker values

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What does this MR do and why?

Prevent choosing invalid pat expiration date picker values.

Both min and max date where incorrect. Now max date follows this rules:

Type	Require expiration date on	Require expiration date off
CE	Max: 365/400 days (depending on the buffered_token_expiration_limit FF)	No max date
EE	Max: 365/400 days (when max_personal_access_token_lifetime is blank) Max: X days (when max_personal_access_token_lifetime is X < 365)	No max date

Closes #432403 (closed)

Closes #508503 (closed)

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🛠️ with ❤️ at Siemens

/cc @bufferoverflow @max-wittig @nejch @fh1ch @ercan.ucan