fix(bzlmod): allow modules to register the same toolchain as rules_python's default #1642
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This fixes a bug where, if a module tries to register a non-default toolchain with the
same version as rules_python's default toolchain, an error would occur. This happened
because the earlier (non-default) toolchain caused the later (default) toolchain to
be entirely skipped, and then no default toolchain would be seen. This most affects
intermediary modules that need to register a toolchain, but can't specify a default one.
To fix, just skip creating and registering the duplicate toolchain, but still check
its default-ness to determine if it's the default toolchain.
Fixes #1638