Switch Default TAS Placement Algorithm from BestFit to Mixed.

[iomarsayed]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Switch Default TAS Placement Algorithm from BestFit to Mixed, by enabling TAS Mixed Profile.

Which issue(s) this PR fixes:

Fixes #7214

Does this PR introduce a user-facing change?

TAS: change the algorithm used in case of "unconstrained" mode (enabled by the kueue.x-k8s.io/podset-unconstrained-topology annotation, or when the "implicit" mode s used) from "BestFit" to "LeastFreeCapacity". 

This allows to optimize the fragmentation for workloads which don't require bin-packing.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @iomarsayed. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mimowo]

/ok-to-test
Thanks 👍

[mimowo]

It should no longer be deprecated since enabled by default, I think it should be

a new entry rather than modifying old, so:

		{Version: version.MustParse("0.10"), Default: false, PreRelease: featuregate.Alpha},
		{Version: version.MustParse("0.11"), Default: false, PreRelease: featuregate.Deprecated},
		{Version: version.MustParse("0.15"), Default: true, PreRelease: featuregate.Beta},

[mimowo]

Please also adjust the KEP in the table https://github.com/kubernetes-sigs/kueue/pull/7144/files#diff-c8054619a353d0fc872425de6a22f0df62001353eb75f856d5ba504553b5fcbfR1075

cc @olekzabl

[mimowo]

/release-note-edit

TAS: change the algorithm used in case of "unconstrained" mode (enabled by the kueue.x-k8s.io/podset-unconstrained-topology annotation, or when the "implicit" mode s used) from "BestFit" to "LeastFreeCapacity". 

This allows to optimize the fragmentation for workloads which don't require bin-packing.