Merge pull request #62076 from qingling128/master

Automatic merge from submit-queue. 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 support to ingest log entries to Stackdriver against new "k8s_container" and "k8s_node" resources.

**What this PR does / why we need it**:

**Which issue(s) this PR fixes**
Fluentd 0.14 has some memory leak issues that caused the e2e tests to be flaky. Downgrading to v0.12.

**Special notes for your reviewer**:
We never released any previous version with Fluentd v0.14. Only upgraded it very recently. So this downgrading is not visible to users.

**Release note**:
```release-note
Add support to ingest log entries to Stackdriver against new "k8s_container" and "k8s_node" resources.
```