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Ignore unready pods when calculating desired replicas
**What this PR does / why we need it**:
This PR causes `GetExternalMetricReplicas` and `GetObjectMetricReplicas` to ignore unready pods when computing the number of desired replicas. If we don't ignore unready pods, there is a risk of overscaling. See the commit messages for examples and implementation info.
**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#59975
**Special notes for your reviewer**:
@MaciekPytel and I consciously chose to save `GetExternalPerPodMetricReplicas` for a separate PR, as we aren't definite on what is the preferred behavior.
**Release note**:
```release-note
Unready pods will no longer impact the number of desired replicas when using horizontal auto-scaling with external metrics or object metrics.
```
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