ci: use priority scheduler in e2e tests

[kkunapuli]

Ticket

RM-315

Description

e2e scheduler tests use the default scheduler. Update tests to use the priority scheduler since it is now default.

Test Plan

None needed.

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.

[netlify]

✅ Deploy Preview for determined-ui canceled.

Name	Link
🔨 Latest commit	8fa2214
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/665612bd1e476a0008eb2f0c

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.61%. Comparing base (684c38b) to head (8fa2214).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9430   +/-   ##
=======================================
  Coverage   48.61%   48.61%           
=======================================
  Files        1233     1233           
  Lines      158975   158973    -2     
  Branches     2778     2778           
=======================================
+ Hits        77283    77284    +1     
+ Misses      81518    81515    -3     
  Partials      174      174           

Flag	Coverage Δ
backend	42.17% <ø> (ø)
harness	64.02% <ø> (+<0.01%)	⬆️
web	44.39% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 3 files with indirect coverage changes

[NicholasBlaskey]

assuming this passes CI

lgtm