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* iceberg: authorize a commit before staging its metadata file Both commit paths (CommitTable and CommitTransaction) write the new vN.metadata.json into the table's metadata/ directory and only then reach UpdateTable, whose authorization refuses a caller that may read the table but not commit to it. The refused commit then deletes the staged file on the way out, so such a caller could make the server write and delete a file under the table's prefix on every attempt. The same shape was closed for creates in #10991. Both paths now ask Manager.AuthorizeUpdateTable right after loading the table and answer 403 ForbiddenException before anything is staged. UpdateTable still decides under the policies in force when the pointer flips, so a policy changed mid-commit is caught as before. Test: TestCommitDeniedBeforeStagingMetadata records every file the handlers create; on master both the single-table and the transaction commit by a GetTable-only identity write v2.metadata.json before answering 403, with the change nothing is written. TestCommitAllowedStagesMetadata is the positive control (the owner, and an identity whose own actions include UpdateTable). * iceberg: authorize a view commit before staging its metadata handleUpdateView has the same write-before-authorize gap the table commit paths had: it stages the new metadata file and only reaches the UpdateView authorization at the pointer flip, so a caller who may only load the view could still make the server write and delete files under it. Gate it on AuthorizeUpdateView, mirroring authorizeCommit. * iceberg: seed committed view metadata in the denied-commit test Without stored view metadata the request fails on the missing-metadata check before it could stage a file, so the zero-write assertion could not catch a write-before-denial regression. Seed the same metadata the allowed-path test uses so the denied request would otherwise stage. --------- Co-authored-by: Javier de la Torre <jatorre@lakehousebox.com> Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>