fix: okta_app_oauth add jwt-bearer to the valid grant types of native…

[dnychennnn]

… app

During the import of remote native apps, we encountered the validation issue which reject the creation of urn:ietf:params:oauth:grant-type:jwt-bearer grant.

Error: failed to update OAuth application: failed conditional validation for field "grant_types" of type "native", it can contain authorization_code, implicit, refresh_token, password, urn:ietf:params:oauth:grant-type:saml2-bearer, urn:ietf:params:oauth:grant-type:token-exchange, urn:ietf:params:oauth:grant-type:device_code, interaction_code, urn:okta:params:oauth:grant-type:oob, urn:okta:params:oauth:grant-type:otp, http://auth0.com/oauth/grant-type/mfa-oob, http://auth0.com/oauth/grant-type/mfa-otp and must contain authorization_code, received urn:ietf:params:oauth:grant-type:jwt-bearer, authorization_code, refresh_token

Though it's not available on the tenant UI, it is a valid grant type according to https://developer.okta.com/docs/guides/authenticators-custom-authenticator/android/main/#maintenance-token-configuration-and-usage

[monde]

@dnychennnn I'll get this into the next release