charts/timescaledb-single: Allow to set priority class

[may-cDev]

What this PR does / why we need it

Adds functionality to set priority class

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes Allow to set priority class to timescale StatefulSet #607

Special notes for your reviewer

Checklist

• Chart Version bumped
• CLA signed

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[mfornasa]

Hi everyone. Any chance that this will be merged? Anything I can do to help? @mathisve