refactor(panda-pulse): multiple jobs if cl/el arrays passed

[mattevans]

Refactors chart to allow passing of an optional array of ethereumCls and/or ethereumEls.

If ethereumCls + ethereumEls are both omitted, then a single cron will be created as normal capturing all clients.

For example:

helm install panda-pulse ./charts/panda-pulse \
  --set config.network=NETWORK_NAME_HERE \
  --set config.discordChannel=DISCORD_CHANNEL_ID_HERE \
  --set config.ethereumCls="{lighthouse,nimbus}" \
  --set config.ethereumEls="{geth,reth}" \
  --set secrets.grafanaServiceToken=GRAFANA_SERVICE_TOKEN_HERE \
  --set secrets.discordBotToken=DISCORD_BOT_TOKEN_HERE

NAME                        SCHEDULE      TIMEZONE   SUSPEND   ACTIVE   LAST SCHEDULE   AGE
panda-pulse-cl-lighthouse   0/2 * * * *   <none>     False     0        <none>          3s
panda-pulse-cl-nimbus       0/2 * * * *   <none>     False     0        <none>          3s
panda-pulse-el-geth         0/2 * * * *   <none>     False     0        <none>          3s
panda-pulse-el-reth         0/2 * * * *   <none>     False     0        <none>          3s