Add updatedReplicas to Status

[kerthcet]

What type of PR is this?

/kind feature

What this PR does / why we need it

Which issue(s) this PR fixes

part of #3

Special notes for your reviewer

Does this PR introduce a user-facing change?

Add updatedReplicas to leaderWorkerSet status.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kerthcet

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [kerthcet]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ahg-g]

why? are we not concerned this will make it flaky?

[kerthcet]

Timeout is shared by integration-test and e2e-test, 1 minute is too long for waiting integration test to fail if we have. We can fasten this if necessary, but right now, 30s is enough for what I'm testing. (I added some optimizations like update the name rather than the image which will slow down the rolling update process)

[ahg-g]

/lgtm
/label tide/merge-method-squash