[Merged by Bors] - chore: mark Homeomorph.isCompact_{pre}image simp #7594
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The analogous lemmas for open, closed, preconnected, connected sets are all tagged simp.
@eric-wieser suggested doing so for the analogous lemma of sigma-compact sets in #7576 (which passed the simp linter).
Let's see what CI would say about these two.