feat: add helm chart support for multiple expanders including "priority"

[JoshVee]

Which component this PR applies to?

helm charts

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add support for multiple expanders to the Helm chart, as per #4233.

This change allows the "priority" expander to be used along with other expanders.

Which issue(s) this PR fixes:

N\A

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Add Helm support for multiple expanders including "priority".

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Josh V (e85b2e8)

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[JoshVee]

/assign @gjtempleton

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The committers are authorized under a signed CLA.

• ✅ Josh V (e85b2e8, 0a26a60, 529ab3e)

[gjtempleton]

Thanks for this!
/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gjtempleton, JoshVee

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[AndrewFarley]

@gjtempleton Please review this MR against the other one I did, I don't have time to confirm, but based on a brief look at the changelogs, you may have missed a few places to ensure this MR does what it should. See: #4503

EDIT: Nevermind, after closer inspection looks like you got them all. Great work, cheers!