test(otlp-grpc-exporter-base): increase timeout in flaky test

[cjihrig]

Which problem is this PR solving?

A 100ms timeout leads to flaky test failures on slow operating systems running on slow CI machines.

Fixes # https://github.com/open-telemetry/opentelemetry-js/actions/runs/18766046670/job/53541209988

Short description of the changes

This commit increases the timeout substantially so it should no longer be an issue. The timeout itself does not appear to be part of any test functionality, as Mocha is not reporting any additional slow tests because of the change.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Reproduced the CI issue locally by reducing the timeout duration.
• Increased the timeout and verified that all tests passed again without any additional delays in the tests.

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.14%. Comparing base (7e0d45f) to head (f8009cb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6042   +/-   ##
=======================================
  Coverage   95.14%   95.14%           
=======================================
  Files         315      315           
  Lines        9161     9161           
  Branches     2022     2022           
=======================================
  Hits         8716     8716           
  Misses        445      445           

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[pichlermarc]

thanks!

[otelbot]

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