Add scope for OAUTH2 authentication in Iceberg's REST catalog

[denodo-research-labs]

Description

Presto issue #23833

Motivation and Context

When we configure the iceberg.rest.auth.oauth2.credential property to connect to a Polaris catalog we get the error The scope is invalid.
Since the Presto code does not set the 'scope' property, the Iceberg code is using 'catalog' as scope and the OAuth2 endpoint is considering it an invalid scope.

Impact

We cannot connect to the Polaris catalog using the iceberg.rest.auth.oauth2.credential property.

Test Plan

Modified tests in TestIcebergRestConfig

Contributor checklist

• Please make sure your submission complies with our development, formatting, commit message, and attribution guidelines.
• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
• If release notes are required, they follow the release notes guidelines.
• Adequate tests were added if applicable.
• CI passed.

Release Notes

Please follow release notes guidelines and fill in the release notes below.

== RELEASE NOTES ==

Iceberg Connector Changes
* Add configuration property ``iceberg.rest.auth.oauth2.scope`` for OAUTH2 authentication in Iceberg's REST catalog :pr:`23884`

[ZacBlanco]

@kiersten-stokes do you want to look at this?

[steveburnett]

LGTM! (docs)

Pull branch, local doc build, looks good. Thanks!

[kiersten-stokes]

Makes sense to me - thanks!