fix(elem declare): do not instantiate a declarative element

[marxin]

Fixes: #6534

[Copilot]

Pull request overview

Fixes the compiler translation path so that declarative element segments are not instantiated/parsed into runtime element data, which prevents valid modules (e.g. using global.get in a declarative element initializer) from being rejected during compile/run.

Changes:

• Skip reading/parsing element items for ElementKind::Declared to avoid triggering unsupported-init-expr errors for declarative segments.
• Add a regression test covering a declarative element segment whose initializer is (global.get 0) (issue #6534).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
lib/compiler/src/translator/sections.rs	Moves read_elems(&items) into the Active/Passive arms so Declarative segments are ignored (not instantiated).
tests/compilers/issues.rs	Adds a compiler regression test that compiles/instantiates a module containing a declarative element segment initialized via global.get.