fix(redis-ha): match pdb selectors with sts selectors

[dadangnh]

What this PR does / why we need it:

Fixes the following message on GKE:

StatefulSet doesn't have a Pod Disruption Budget. This means that all Pods in the StatefulSet might experience simultaneous disruption during scenarios like node upgrades

Which issue this PR fixes

• fixes [chart/redis-ha>][BUG] PDB's selectors are not an exact match against StatefulSet selectors #307

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• DCO signed
• Chart Version bumped
• Variables are documented in the README.md
• Title of the PR starts with chart name (e.g. [stable/mychartname])

[DandyDeveloper]

@dadangnh Would it not be better here to update the PDB rather than the STS?

[dadangnh]

@DandyDeveloper I'd like to update the PDB but it stated that the additional labels is required to prevent test pod counted

# The replica label is set on StatefulSet pods but not the Test pods
# We want to avoid including the Test pods in the budget
{{ template "redis-ha.fullname" . }}: replica

Can I remove it?