[Backport staging-25.05] versionCheckHook: Default `versionCheckProgram` to `mainProgram`#454228

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backport-412768-to-staging-25.05

Commits on Oct 21, 2025

stdenv: pass `meta.mainProgram` to build environment as `NIX_MAIN_PROGRAM`

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doc/rl-25.11: Changing `meta.mainProgram` influences package rebuilds

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versionCheckHook: consider `NIX_MAIN_PROGRAM` as a fallback for `versionCheckProgram`

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doc: `versionCheckProgram` first defaults to `$outputBin/bin/$NIX_MAIN_PROGRAM`

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versionCheckHook: emit warning when falling back to pname

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