chore(tests): Increase timeout on plugman install tests

[dpogue]

Platforms affected

All

Motivation and Context

These tests are intermittently (but commonly) failing in CI on Windows due to hitting this timeout. As a stopgap measure, let's increase the timeout and see if that makes it more reliable.

Description

Increase the beforeAll timeout from 18000 to 27000 for Plugman install test cases.

Testing

We'll see if CI is happy with this...

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.61%. Comparing base (3a3ac57) to head (46124a6).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #979   +/-   ##
=======================================
  Coverage   89.61%   89.61%           
=======================================
  Files          41       41           
  Lines        5190     5190           
=======================================
  Hits         4651     4651           
  Misses        539      539           

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[erisu]

LGTM