Change notifications for Exploit Mitigations PG

Reduce the amount of notifications sent to all the Exploit Mitigations
PG by removing it from some of the paths.

Author: rcvalle

triagebot.toml

@@ -1002,7 +1002,7 @@ message = "Changes to the size of AST and/or HIR nodes."
 cc = ["@nnethercote"]
 
 [mentions."compiler/rustc_sanitizers"]
-cc = ["@rust-lang/project-exploit-mitigations", "@rcvalle"]
+cc = ["@rcvalle"]
 
 [mentions."src/doc/rustc/src/exploit-mitigations.md"]
 cc = ["@rust-lang/project-exploit-mitigations", "@rcvalle"]
@@ -1038,7 +1038,7 @@ cc = ["@Urgau"]
 cc = ["@Noratrieb"]
 
 [mentions."tests/codegen/sanitizer"]
-cc = ["@rust-lang/project-exploit-mitigations", "@rcvalle"]
+cc = ["@rcvalle"]
 
 [mentions."tests/codegen/split-lto-unit.rs"]
 cc = ["@rust-lang/project-exploit-mitigations", "@rcvalle"]