Remove duplicated label in helm chart: app.kubernetes.io/instance

[DiegoLelis]

What type of PR is this?

/kind bug

What this PR does / why we need it

Changes the behaviour of a couple of functions and introduces 2 other functions to make sure the label app.kubernetes.io/instance is not set twice.
Also fixed the typo on the certificate file name.

Which issue(s) this PR fixes

Fixes #353

Special notes for your reviewer

The previous behaviour added the label app.kubernetes.io/instance twice on a few resources.
I've tried to keep changes minimal, and to respect the previous design to the best of my ability.
Kept all the previous labels, only removed the duplicated ones.
When choosing to remove between the more generic label, and the more specific one, I choose to deprecate the more generic one.
Tested installing on my cluster with default values and it works.

Does this PR introduce a user-facing change?

Removes duplicated label `app.kubernetes.io/instance` from helm chart.

[linux-foundation-easycla]

• ✅login: DiegoLelis / (d895e6a)
• ✅login: DiegoLelis / (d895e6a, a7670f1)

The committers listed above are authorized under a signed CLA.

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[k8s-ci-robot]

Hi @DiegoLelis. Thanks for your PR.

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[DiegoLelis]

/assign @Edwinhr716

[Edwinhr716]

/ok-to-test

[Edwinhr716]

/lgtm
makes sense to me to keep the label set in the resources instead

[ahg-g]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, DiegoLelis

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