feat: bump redis-cluster-repo-cache apdex to 0.9999

Sylvester Chinrequested to merge
sc1-adjust-apdex-rediscluster-repo-cache into master

This MR adjusts redis-cluster-repo-cache monitoring apdex threshold to 0.9999.

From gitlab-com/gl-infra/production#18676 (comment 2149399770)

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