kep: update graduation criteria

[sohankunkerkar]

Update KEP-77 graduation criteria based on #8651 discussion

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #8651 (comment)

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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[Copilot]

Pull request overview

Updates KEP-77 (“Dynamically Sized Jobs”) graduation criteria to better scope Beta/GA requirements for ElasticJobsViaWorkloadSlices, and introduces separate graduation criteria for the TAS-gated integration (ElasticJobsViaWorkloadSlicesWithTAS) based on the #8651 discussion.

Changes:

• Refines Beta graduation criteria to emphasize validation, observability, and controller readiness, while marking a few items as completed.
• Reframes GA graduation criteria to include broader ecosystem enablement, GC expectations, and re-evaluation items.
• Adds a dedicated “ElasticJobsViaWorkloadSlicesWithTAS Graduation Criteria” section with Alpha/Beta milestones for TAS integration.

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[mimowo]

cc @ichekrygin @hiboyang @yaroslava-serdiuk ptal

[tenzen-y]

/cc