Automatic merge from submit-queue (batch tested with PRs 65024, 65287, 65345, 64693, 64941). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Add a helper function to customize K8s addon yamls and use it to customize Calico addons on GKE
**What this PR does / why we need it**:
Allow customizing Calico addon in GCP. With #65022, this allows us to do a couple of things:, e.g., run Calico 3.0+ on GCP, use a non-default MTU etc.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#65045, #65067
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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