feat: add ModelServing eviction protection

[avinxshKD]

What type of PR is this?

/kind enhancement

What this PR does / why we need it:

Adds configurable eviction protection to ModelServing workloads.

Operators can preserve either a minimum number of ready ServingGroups or a minimum number of available instances for specific roles. The controller manages PodDisruptionBudgets for the protected ServingGroups or role instances.

Which issue(s) this PR fixes:

Fixes #1481

Bug evidence (required for bug-related PRs):

N/A

Special notes for your reviewer:

PDBs count Pods, while a ServingGroup or role instance can contain multiple Pods. This change creates a PDB for each protected logical unit so an eviction cannot partially disrupt it.

Does this PR introduce a user-facing change?:

Add configurable ServingGroup and role-level eviction protection for ModelServing workloads.

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[LiZhenCheng9527]

Have you verified this feature?
This is a very important feature in a production environment.

[avinxshKD]

Have you verified this feature? This is a very important feature in a production environment.

sir, the controller and validation tests r passing. Im working through the full node-drain and concurrent eviction scenarios now. I'll share the results here once the verification is complete.

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[katara-Jayprakash]

@avinxshKD ditto #1485

[kube-gopher]

@avinxshKD Sorry, this has already been taken care of by #1485. It has been validated and tested in both the production environment and on Kind clusters. To keep the PR clean, I will go ahead and close this one. Thank you for your contribution.

[avinxshKD]

@avinxshKD Sorry, this has already been taken care of by #1485. It has been validated and tested in both the production environment and on Kind clusters. To keep the PR clean, I will go ahead and close this one. Thank you for your contribution.

thankyou sir will be learing from and watching that PR, closing this