feat(helm-chart): Add support for extraSecretMounts subPath (#5960)

[BlueNc]

Fixes #5960

[jsjoeio]

@Matthew-Beckett mind helping us review this?

[codecov]

Codecov Report

Merging #5961 (368ecec) into main (7c2aa8c) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5961   +/-   ##
=======================================
  Coverage   71.75%   71.75%           
=======================================
  Files          31       31           
  Lines        1696     1696           
  Branches      372      372           
=======================================
  Hits         1217     1217           
  Misses        401      401           
  Partials       78       78           

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[code-asher]

Sorry for the delay on this one, and thank you!