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* fix(functions): Refresh credentials before enqueueing task

This change addresses an issue where enqueueing a task from a Cloud Function would fail with a InvalidArgumentError error. This was caused by uninitialized credentials being used to in the task payload.

The fix explicitly refreshes the credential before accessing the credential, ensuring a valid token or service account email is used in the in the task payload.

This also includes a correction for an f-string typo in the Authorization header construction.

* fix(functions): Move credential refresh to functions service init

* fix(functions): Moved credential refresh to run on task payload update with freshness guard

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Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

* feat(functions): Enable Cloud Task Queue Emulator support

* fix: lint

* fix: Resolved issues from gemini review

* chore: Added basic integration tests for task enqueue and delete

* chore: Setup emulator testing for Functions integration tests

* fix: Re-added accidentally removed lint

* fix: integration test default apps

* fix: lint

* chore: Update default branch to main

* set java version to fix emulator tools

…#932)

* chore: Pinned github actions to full-length comit SHAs

* chore: Update integration test resource

* chore: Added environment label to release action

* Trigger integration tests

* chore: Update release workflows for push triggers

* chore: Update release instructions and fix tag creation