move iosworkflow to globals

[christopherfujino]

Description

Add an IOSWorkflow context getter to globals.dart. Added a TODO to remove the getter in ios_workflow.dart after internal references are replaced by globals.iosWorkflow.

This is part 1 of making #51671 soft-breaking.

Tests

Tests were updated use the new globals getter.

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[jmagman]

LGTM

[lock]

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