Avoid preloading GML schema on GML object construction

Description

This reverts part of https://osgeo-org.atlassian.net/browse/GEOT-3327 work, by avoiding to preload the entire GML XML schema on object instantiation. Built both GT and GS, with app-schema integration tests, finding no regressions.

Environment

None

Status

Assignee

Andrea Aime

Reporter

Andrea Aime

Triage

None

Components

Fix versions

Priority

Medium
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