Update codecov token name to match other repos

[natemort]

What changed?

• Allow codecov data to be uploaded from CI.

Why?

• Enforces code coverage on future PRs.

How did you test it?

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (master@405c755). Learn more about missing BASE report.

Additional details and impacted files

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[coveralls]

Pull Request Test Coverage Report for Build 2545

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 3 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.01%) to 66.185%

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Files with Coverage Reduction	New Missed Lines	%
src/main/java/com/uber/cadence/internal/testservice/TestWorkflowMutableStateImpl.java	1	83.5%
src/main/java/com/uber/cadence/internal/sync/WorkflowThreadImpl.java	1	77.32%
src/main/java/com/uber/cadence/internal/worker/Poller.java	1	78.13%

Totals
Change from base Build 2544:	-0.01%
Covered Lines:	12908
Relevant Lines:	19503

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💛 - Coveralls