chore: hide genai helm values config and fix var name

[tayritenour]

Description

Follow up to #8727. Hide the genai helm block

Also make the extraResourcePoolMetadata consistent with other helm variable names

Test Plan

Should not need specific testing beyond what #8727 specifies.

Commentary (optional)

Checklist

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

Ticket

[netlify]

✅ Deploy Preview for determined-ui canceled.

Name	Link
🔨 Latest commit	522d28e
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ed61121) 47.81% compared to head (522d28e) 47.80%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8821      +/-   ##
==========================================
- Coverage   47.81%   47.80%   -0.01%     
==========================================
  Files        1050     1050              
  Lines      167394   167394              
  Branches     2240     2237       -3     
==========================================
- Hits        80032    80031       -1     
- Misses      87204    87205       +1     
  Partials      158      158              

Flag	Coverage Δ
backend	43.70% <ø> (+<0.01%)	⬆️
harness	64.32% <ø> (-0.01%)	⬇️
web	42.53% <ø> (ø)

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see 3 files with indirect coverage changes