[artifactory-ha] Add optional pod management policy

[bastirlnd]

PR Checklist

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• Title of the PR starts with chart name (e.g. [artifactory])

What this PR does / why we need it:
Adds (optional) podManagementPolicy to the artifactory-ha charts.
-> Optional to ensure backwards compatibility

Special notes for your reviewer:
We've tested this on our staging environment already and it works like a charm!

Sidenote, I've discovered an issue with the linting process during my contribution steps.
On both master and my branch with its changes the same output appears when running make lint -- --charts stable/artifactory-ha

❯ make lint -- --charts stable/artifactory-ha
test/lint-charts.sh
Installing kubeval...
Local run, not downloading kubeval cli...
Installing helm...
Local run, not downloading helm cli...
Error response from daemon: No such container: ct
Linting charts...
Version increment checking disabled.

------------------------------------------------------------------------------------------------------------------------
 Charts to be processed:
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 artifactory-ha => (version: "107.146.8", path: "stable/artifactory-ha")
------------------------------------------------------------------------------------------------------------------------

"jfrog" has been added to your repositories
Hang tight while we grab the latest from your chart repositories...
...Successfully got an update from the "jfrog" chart repository
Update Complete. ⎈Happy Helming!⎈
Saving 1 charts
Downloading postgresql from repo https://charts.jfrog.io/
Deleting outdated charts
Linting chart 'artifactory-ha => (version: "107.146.8", path: "stable/artifactory-ha")'
Validating /workdir/stable/artifactory-ha/Chart.yaml...
Validation success! 👍

Linting chart with values file 'stable/artifactory-ha/ci/access-tls-values.yaml'...

==> Linting stable/artifactory-ha
[ERROR] templates/: template: artifactory-ha/templates/artifactory-node-statefulset.yaml:1:18: executing "artifactory-ha/templates/artifactory-node-statefulset.yaml" at <.Values.artifactory.node.replicaCount>: nil pointer evaluating interface {}.replicaCount

------------------------------------------------------------------------------------------------------------------------
 ✖︎ artifactory-ha => (version: "107.146.8", path: "stable/artifactory-ha") > Error waiting for process: exit status 1
Error: Error linting charts: Error processing charts
------------------------------------------------------------------------------------------------------------------------
Error linting charts: Error processing charts
make: *** [Makefile:56: lint] Error 1

As this occurs independently to my changes and since my chart change runs in our environment without issues, I have decided to open this PR as well as report the issues with the linting steps!

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[bastirlnd]

I have read the CLA Document and I hereby sign the CLA

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