feat: add database snapshot functionality to Helm chart

[carolinaecalderon]

Ticket

CM-448

Description

See notes: https://hpe-aiatscale.atlassian.net/wiki/spaces/ENGINEERIN/pages/1748041758/Guide+Release+Party+Database+Backups
TLDR; add Helm values such that you can easily snapshot/backup OR restore a database's persistent volume.

Test Plan

Manual testing or N/A

Checklist

• Changes have been manually QA'd
• New features have been approved by the corresponding PM
• User-facing API changes have the "User-facing API Change" label
• Release notes have been added as a separate file under docs/release-notes/
  See Release Note for details.
• Licenses have been included for new code which was copied and/or modified from any external code

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.49%. Comparing base (f758303) to head (1c4624d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
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- Coverage   54.50%   54.49%   -0.01%     
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  Files        1255     1255              
  Lines      156733   156733              
  Branches     3601     3600       -1     
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- Hits        85424    85414      -10     
- Misses      71176    71186      +10     
  Partials      133      133              

Flag	Coverage Δ
backend	45.14% <ø> (-0.02%)	⬇️
harness	72.74% <ø> (ø)
web	54.27% <ø> (ø)

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see 4 files with indirect coverage changes

[maxrussell]

High-level, I like the values and docs! Left a couple comments of minor questions/suggestions. Approving, though, because they're optional if you don't think they'd be improvements.

[tara-hpe]

added suggested edits