chore: prettify syntax in redis-sentiel,redis-cluster,redis-operator

[genofire]

remove all the bad syntax:

• eq .Values.externalConfig.enabled true
• {{ if .a.b.c }}{{ .a.b.c}}{{ end }} -> {{ with .a.b.c }}{{ . }}{{ end }}
• {{ range $key, $value }} -> {{ toYaml }}
• nicer indent, with nindent and {{-

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a first step before improve any logic ....

• in redis-cluster just one servicemonitor ...

[genofire]

rebased -> could anyone please merge it? @shubham-cmyk ??