Rollup merge of #135032 - jieyouxu:relnotes-interest-group, r=cuviper

triagebot: register `relnotes-interest-group` ping group

Part of #133334.
rust-lang/team#1613 merged.
cc T-release discussions in https://rust-lang.zulipchat.com/#narrow/channel/241545-t-release/topic/Please.20CC.20lang

r? release

triagebot.toml

@@ -172,6 +172,12 @@ issues).
 """
 label = "O-emscripten"
 
+[ping.relnotes-interest-group]
+message = """\
+Hi relnotes-interest-group, this PR adds release notes. Could you review this PR
+if you have time? Thanks <3
+"""
+
 [prioritize]
 label = "I-prioritize"