identityplatform OauthIdpConfig does not support code flow grant types

[VenelinMartinov]

Describe what happened

reported in #2169 (comment)

It seems that the resource does not allow changing the grant type, even though the docs suggest that should happen if a secret is set.

This is inherited from upstream: hashicorp/terraform-provider-google#9385

The GCP API does seem to support it https://cloud.google.com/identity-platform/docs/reference/rest/v2/projects.oauthIdpConfigs#OAuthIdpConfig but the parameter does not seem to be used in the TF provider: https://cloud.google.com/identity-platform/docs/reference/rest/v2/projects.oauthIdpConfigs#OAuthIdpConfig

Sample program

oidc_provider = gcp.identityplatform.OauthIdpConfig(
    "foobar",
    name="oidc.foobar",
    client_id="foo",
    issuer="www.foobar.com/foobar/baz/qux",
    client_secret="foo",
    opts=pulumi.ResourceOptions(depends_on=[identity_toolkit]),
)

Log output

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Affected Resource(s)

No response

Output of pulumi about

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Additional context

No response

Contributing

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