[Infra] Add --legacy flag to xcresulttool

[andrewheard]

Added --legacy to the invocation of xcresulttool to temporarily fix the following error:

xcrun xcresulttool get --path /Users/runner/Library/Developer/Xcode/DerivedData/FirebaseCombineSwift-gkzikpntrmtrlteyoawsixkbxldq/Logs/Test/Test-FirebaseCombineSwift-Unit-integration-2025.04.15_07-24-19-+0000.xcresult --format json
Error: This command is deprecated and will be removed in a future release, --legacy flag is required to use it.
Usage: xcresulttool get object [--legacy] --path <path> [--id <id>] [--version <version>] [--format <format>]
  See 'xcresulttool get object --help' for more information.

Note: We'll need to find an alternative eventually since "command is deprecated and will be removed in a future release".

(cherry picked from commit 9b63014)

#no-changelog

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[ncooke3]

Not sure how this isn't fixing the combine workflow: https://github.com/firebase/firebase-ios-sdk/actions/runs/14486724441/workflow