chore(ci): reject uncanonicalized issue link in commits

This will allows only canonicalized links in commit messages, such as
* `https://github.com/rust-lang/cargo/issues/15882`
* `#15882`

but `#15882`.

See

* https://forge.rust-lang.org/triagebot/issue-links.html
* https://rust-lang.zulipchat.com/#narrow/channel/246057-t-cargo/topic/Turning.20cargo.20into.20a.20subtree/near/537951273
* #15882

Author: weihanglo

triagebot.toml

@@ -61,6 +61,9 @@ review_labels = ["S-waiting-on-review"]
 remove_labels = ["S-waiting-on-author"]
 add_labels = ["S-waiting-on-review"]
 
+[issue-links]
+check-commits = "uncanonicalized"
+
 [autolabel."A-build-execution"]
 trigger_files = [
   "src/cargo/core/compiler/compilation.rs",