[Infra] Add workflow_dispatch trigger to enable manual dispatch of workflows.

[ncooke3]

This change adds the workflow_dispatch trigger to the following workflow files:

• .github/workflows/abtesting.yml
• .github/workflows/analytics.yml
• .github/workflows/appdistribution.yml
• .github/workflows/archiving.yml
• .github/workflows/auth.yml
• .github/workflows/check.yml
• .github/workflows/client_app.yml
• .github/workflows/cocoapods-integration.yml
• .github/workflows/combine.yml
• .github/workflows/core.yml
• .github/workflows/core_extension.yml
• .github/workflows/core_internal.yml
• .github/workflows/crashlytics.yml

This allows these workflows to be manually triggered in addition to their existing triggers.

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[andrewheard]

Thanks, Nick! CI failures all look unrelated to me.