[STACKED] [COMPILETEST-UNTANGLE 3/N] Use "directives" consistently within compiletest #143232
+165
−115
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Caution
Stacked on top of #143230.
Instead of using both "headers" and "directives" within compiletest to refer to the same thing. This of course induces some churn, but it's been bugging me for a while, and I rather do the self-consistency changes now than later.
The first commit tries to be mostly move-only to help per-file git history.
I intend to revisit rustc-dev-guide's testing docs, but I don't want to do it on rust-lang/rust side because it would need syncing and might conflict.
r? ghost