QA: normalize versions to [lts, 1] (drop pre) (#1485)

Normalize the root test/test_groups.toml [QA] group's `versions` to the
canonical set ["lts", "1"] (Aqua/JET on LTS + latest stable). The repo's
[compat] julia floor is 1.10 (== lts), so the canonical two-element set
applies. Only [QA].versions is changed; functional test groups are left
untouched.

Co-authored-by: Chris Rackauckas (Claude) <accounts@chrisrackauckas.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 3 people

test/test_groups.toml

@@ -23,7 +23,7 @@ versions = ["1", "1.11", "lts"]
 versions = ["1", "1.11", "lts"]
 
 [QA]
-versions = ["1", "1.11", "lts"]
+versions = ["lts", "1"]
 
 [SDE1]
 versions = ["1", "1.11", "lts"]