feat(bzlmod): Use a common constant for detecting bzlmod being enabled #1302
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Various parts of the codebase detect whether bzlmod is enabled or not. Most of them copy/paste the same if @ in Label(..) trick and use a comment to explain what they're doing.
Rather than copy/paste that everywhere, this commit uses a constant defined that does this once and reuses the constant value to determine if bzlmod is enabled.
Closes: #1295