Value relation model and controller unit tests

[gabriel-bolbotina]

Add VR lookup and ordering layer helpers to TestUtils.

For testFormEditors, removed the existing testValueRelationsEditor function and replaced it with 2 tests that check:

• QGIS value format conversions (qgisFormatToArray / arrayToQgisFormat) for single and multi-select
• VR controller async lookup: value-changed lookup, hotreload with filter context, and invalidateSelection

For testModels, replaced the empty tests with:

• VR ordering: by key (asc/desc), by value, and by explicit field name
• VR search: confirms search applies only to the value column, not the key
• VR hotreload: manual reloadFeatures() after feature addition, and auto-reload via the layer editing signal

[github-actions]

Coverage Report for CI Build 27261749506

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Coverage: 57.439%

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• Patch coverage: No coverable lines changed in this PR.

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Coverage Stats

Relevant Lines:	15547
Covered Lines:	8930
Line Coverage:	57.44%
Coverage Strength:	96.67 hits per line

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