fix: downgrade missing userPreferences log from error to warning, deduplicate

[Copilot]

IModelAppUserPreferencesStorage logs an error on every get()/set() call when IModelApp.userPreferences is not defined. This is noisy and misleading—it's a configuration gap, not a runtime failure.

Changes:

• Logger.logError → Logger.logWarning for the "userPreferences not defined" case
• Warning is logged only once per storage instance via a #warnedAboutMissingPreferences guard
• Actual runtime failures (e.g. save/get throwing) remain as logError

private logMissingPreferencesWarning(key: string, action: string) {
  if (!this.#warnedAboutMissingPreferences) {
    Logger.logWarning(LOGGER_CATEGORY, `Cannot ${action} persisted user preference ${key} because 'IModelApp.userPreferences' not defined.`);
    this.#warnedAboutMissingPreferences = true;
  }
}

Tests updated to assert logWarning and verify single-emission behavior.

[grigasp]

@copilot, the change file is missing

[Copilot]

@copilot, the change file is missing

Added in commit Add beachball change file for property-grid-react patch.

[Copilot]

Pull request overview

This PR reduces noise from IModelAppUserPreferencesStorage when IModelApp.userPreferences is not configured by downgrading the log level and deduplicating the message per storage instance, while keeping real runtime failures logged as errors.

Changes:

• Downgrades the “IModelApp.userPreferences not defined” log from Logger.logError to Logger.logWarning.
• Deduplicates the missing-preferences warning so it emits only once per IModelAppUserPreferencesStorage instance.
• Updates/extends unit tests to assert logWarning and verify single-emission behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/itwin/property-grid/src/property-grid-react/api/PreferencesStorage.ts	Logs missing IModelApp.userPreferences as a one-time warning via a private guard/helper.
packages/itwin/property-grid/src/test/api/PreferencesStorage.test.ts	Updates tests to assert logWarning (not logError) and adds single-emission assertions.
change/@itwin-property-grid-react-5e8f999c-021a-422a-9a20-37213d3f8f5c.json	Adds a patch change entry documenting the behavior/logging change.

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