Fix check for OAuth::PromptValuesSupported

[TheOneRing]

No description provided.

[Copilot]

🟡 Changes recommended

Utility::enumValues() uses std::views but utility.h does not include <ranges>, which is likely to cause compilation failures in translation units that include this header.

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Pull request overview

This PR updates OAuth prompt-value handling to correctly treat OAuth::PromptValuesSupported as a Qt flags enum, and introduces a shared Utility::enumValues() helper (with a unit test) to iterate enum/flag values via Qt meta-object data.

Changes:

• Register OAuth::PromptValuesSupported as a flags enum (Q_FLAG) and use meta-enum iteration to stringify supported prompt flags.
• Add Utility::enumValues() for iterating QMetaEnum values, with a new unit test exercising a namespace-scoped flags enum.
• Extend test utilities with a Q_NAMESPACE + Q_FLAG_NS enum for validating enum-utility behavior.

File summaries

File	Description
test/testutils/testutils.h	Adds a namespace-scoped flags enum for testing enum meta-utilities.
test/testutility.cpp	Adds a unit test for Utility::enumValues().
src/libsync/creds/oauth.h	Switches PromptValuesSupported registration from Q_ENUM to Q_FLAG.
src/libsync/creds/oauth.cpp	Uses Utility::enumValues() to stringify all supported prompt flags.
src/libsync/common/utility.h	Introduces Utility::enumValues() based on QMetaEnum.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 3
• Review effort level: Lite

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[guruz]

Probably good if it works, maybe @ogoffart has a better idea (without exotic new C++ features)