Fix duplicate mangled names for interface requirements (#7764)

* Fix duplicate mangled names for interface requirements

Remove linkage decorations from interface method requirement values to prevent
duplicate mangled names and allow DCE to clean up unused functions.

Interface requirements only need the type information, not the linkage,
so the generated IRFunc with export decorations was causing conflicts.

Fixes #7761

Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

* Move linkage decoration removal into default case of switch

Move the removeLinkageDecorations call into the default case of the
switch statement so it only applies to general requirements and not
special cases like associated types.

Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

* Remove conditional check for linkage decoration removal

Apply removeLinkageDecorations unconditionally to interface requirement values
to ensure all requirement values have their linkage decorations removed.

Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

* Change removeLinkageDecorations parameter type from IRGlobalValueWithCode* to IRInst*

This fixes build errors by allowing the function to accept the broader IRInst* type,
making it compatible with the unconditional call in the interface requirement processing.

Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

* format code (#7787)

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Yong He <csyonghe@users.noreply.github.com>
Co-authored-by: slangbot <ellieh+slangbot@nvidia.com>
Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>

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