[backport camel-4.22.x] CAMEL-24375: parseDuration should handle plain millis value

[davsclaus]

Backport of #25412

Cherry-pick of #25412 onto camel-4.22.x.

Original PR: #25412 - CAMEL-24375: parseDuration should handle plain millis value
Original author: @davsclaus
Target branch: camel-4.22.x

Original description

Consolidate duration parsing into TimeUtils.toDuration() so both
CamelContextHelper.parseDuration() and DurationConverter.toDuration()
delegate to a single implementation that handles plain millis, human-
readable (20s, 1m30s), and ISO-8601 (PT20S) formats. This fixes
NoTypeConversionAvailableException when parsing duration values during
early route initialization before the type converter registry is loaded.

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

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[gnodet]

Clean backport of the already-merged #25412 to camel-4.22.x. The diff is identical to the original — a straightforward cherry-pick with no manual modifications.

The fix correctly addresses the NoTypeConversionAvailableException during early route initialization by calling TimeUtils.toDuration() directly instead of going through the type converter registry (which may not yet be loaded). The ISO-8601 parsing logic consolidation into TimeUtils is sound, and tests cover all key duration formats (plain millis, human-readable, ISO-8601, lowercase, negative, null).

This review was generated by an AI agent and may contain inaccuracies. Please verify all suggestions before applying.

Claude Code on behalf of @gnodet