[prestissimo][iceberg] Reformat FileContent enum to multi-line for extensibility

[apurva-meta]

Summary:

• Reformat FileContent enum in presto_protocol_iceberg.h from single-line
  to multi-line for better readability and future extension.
• Add blank line for visual separation before infoColumns initialization.

Protocol files are auto-generated from Java sources via chevron. The manual
edits here mirror what the generator would produce once the Java changes
are landed and the protocol is regenerated.

Differential Revision: D97531548

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Reformats the Iceberg FileContent enum in the Presto C++ protocol header to a multi-line style to improve readability and future extensibility, with no behavioral or semantic changes.

File-Level Changes

Change	Details	Files
Reformat the Iceberg FileContent enum declaration for readability and extensibility.	Change the FileContent enum definition from a single-line declaration to a multi-line, one-enum-value-per-line style Add a trailing comma after the last FileContent enum value to simplify future additions	presto-native-execution/presto_cpp/presto_protocol/connector/iceberg/presto_protocol_iceberg.h

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[steveburnett]

• Please add a release note - or NO RELEASE NOTE - following the Release Notes Guidelines to pass the failing but not required CI check.

• Please edit the PR title to follow semantic commit style to pass the failing and required CI check. See the failure in the test for advice.

[aditi-pandit]

@apurva-meta : Should we be closing this PR ? We don't change protocol generated files. Its better your other changes land first.

Please re-open if you think otherwise.