Fix release-comms usergroup description exceeding Slack 140 char limit

[TineoC]

Fixes

Job: post-community-tempelis-apply (kubernetes/test-infra:
config/jobs/kubernetes/sig-k8s-infra/trusted/sig-contribex-tempelis.yaml)

Latest run, build
2093207476580126720,
base sha b0257f2e8 (the #9133 merge), 2026-08-28 05:22:15 UTC
(raw build log):

2026/08/28 05:22:15 Step 2: Create usergroup release-comms (): name = "Release Communications", description = "Release Communications team for the current Kubernetes release cycle. Members are updated each cycle by the Comms Lead. Has access to the slack-post-message bot for broadcasting to SIG channels.", channels = [release-comms sig-release].
2026/08/28 05:22:15 Failed: failed to update usergroup Release Communications (): slack call failed: description_too_long ([]).
2026/08/28 05:22:15 Step 3: Set members of usergroup release-comms () to [U065E2S9C6P U02GLF28LNM U03DL8UAEMQ].
2026/08/28 05:22:15 Failed: couldn't find the ID for the group "release-comms".

Refs #9042, #9083, #9133

/sig contributor-experience
/sig release
/area slack-management
/cc @jberkus

[kubernetes-prow]

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• ✅ login: TineoC / name: Christopher Tineo (4cf290d)