fix(helm): respect metastore raft extraArgs overrides

[immanuwell]

Helm checks metastore.raft.server-id before adding defaults for metastore.raft.bind-address and metastore.raft.bootstrap-peers.

So if a user sets either override in pyroscope.extraArgs, the chart still renders the default too. The later default wins, pretty sneaky, so the override gets clobbered.

This patch checks the matching keys instead.

Repro:

tmp=$(mktemp)
printf 'architecture:\n  storage:\n    v1: false\n    v2: true\npyroscope:\n  extraArgs:\n    metastore.raft.bind-address: ":1234"\n' > "$tmp"
helm template -n default --kube-version 1.23.0 pyroscope-dev ./operations/pyroscope/helm/pyroscope -f "$tmp" | rg 'metastore\.raft\.bind-address='
rm -f "$tmp"

Before:

-metastore.raft.bind-address=:1234
-metastore.raft.bind-address=:9099

After:

-metastore.raft.bind-address=:1234

Same thing happens for metastore.raft.bootstrap-peers.