Update Stale bot settings

[andreyvelich]

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Purpose of this PR

I updated the stale bot settings which allows us to mark issues and PRs with /lifecycle frozen label that we don't want to close, like here: kubeflow/training-operator#2032 (comment)

Prow bot automatically adds this label to the issues/PRs.

I used the same settings as we use for other projects:

• https://github.com/kubeflow/training-operator/blob/master/.github/workflows/stale.yaml
• https://github.com/kubeflow/katib/blob/master/.github/workflows/stale.yaml

/assign @vara-bonthu @yuchaoran2011 @ChenYi015

Change Category

Indicate the type of change by marking the applicable boxes:

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Rationale

Checklist

Before submitting your PR, please review the following:

• I have conducted a self-review of my own code.
• I have updated documentation accordingly.
• I have added tests that prove my changes are effective or that my feature works.
• Existing unit tests pass locally with my changes.

Additional Notes

[ChenYi015]

Thanks for updating the stale workflow.
/lgtm

[yuchaoran2011]

/lgtm

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ChenYi015, yuchaoran2011

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