Add "phone_verification_code_enabled" into API

What does this MR do and why?

Related issue: #3520 (closed)

Support updating Application settings configuration phone_verification_code_enabled field through API.

Screenshots or screen recordings

When trying to update phone_verification_code_enabled via API:

curl --location --request PUT 'http://127.0.0.1:3000/api/v4/application/settings?phone_verification_code_enabled=false' \
--header 'PRIVATE-TOKEN: {PERSONAL-ACCESS-TOKEN}'

Before	After

How to set up and validate locally

Just call API directly:

curl --location --request PUT 'http://127.0.0.1:3000/api/v4/application/settings?phone_verification_code_enabled=false' \
--header 'PRIVATE-TOKEN: {PERSONAL-ACCESS-TOKEN}'

Looking forward to modifying the phone_verification_code_enabled field successfully.

MR acceptance checklist

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