fix(chart): RFC 1132 compliant name for tmp mount

[hiddeco]

Addresses an issue introduced (by a review suggestion) in #3218. Without this, you will run into:

spec.template.spec.volumes[0].name: Invalid value: "tmpData": a lowercase RFC 1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name', or '123-abc', regex used for validation is [a-z0-9]([-a-z0-9]*[a-z0-9])?)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.55%. Comparing base (6abfa3f) to head (4c8a7c1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3245   +/-   ##
=======================================
  Coverage   51.55%   51.55%           
=======================================
  Files         288      288           
  Lines       26188    26188           
=======================================
  Hits        13502    13502           
  Misses      11960    11960           
  Partials      726      726           

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