ci: wait longer for performance test db to startup

[NicholasBlaskey]

Description

Increase rds creation performance test wait time.

Test Plan

no testing needed

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	8c21706
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/65c0fe72eca38200085e2ac3

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (65c811c) 47.72% compared to head (8c21706) 46.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8796      +/-   ##
==========================================
- Coverage   47.72%   46.84%   -0.88%     
==========================================
  Files        1049      619     -430     
  Lines      167258    71384   -95874     
  Branches     2243        0    -2243     
==========================================
- Hits        79824    33441   -46383     
+ Misses      87276    37943   -49333     
+ Partials      158        0     -158     

Flag	Coverage Δ
harness	50.18% <ø> (-14.14%)	⬇️
web	?

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see 570 files with indirect coverage changes