Kotlin: clean up alternate-version code now that v1.5.x support is dropped#19496

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smowton wants to merge 2 commits intogithub:mainfrom

smowton:smowton/admin/cleanup-kotlin-versions

Commits on May 15, 2025

Fold v_1_5_0 and v_1_5_20 files forwards into v_1_6_0, dropping any that are overridden
smowton
committed
Inline version-specific override code where there is now only one version
smowton
committed