[AIROCMLIR-692] Standardize Jenkins CODEPATH gfx bucket names

[bogdan-petkovic]

Motivation

Standardize Jenkins CODEPATH naming to a single gfx-based convention for RDNA families and remove mixed naming (navi* + gfx*) in CI matrix routing.
This improves readability and consistency across CODEPATH parameter values, matrix axes, and gating toggles.

Technical Details

This PR performs a hard rename of Jenkins CODEPATH buckets in mlir/utils/jenkins/Jenkinsfile:

• navi21 -> gfx10x
• navi3x -> gfx11x
• navi4x -> gfx12x

Kept unchanged:

• mfma
• vanilla
• gfx950

Test Plan

Static validation:

• searched for stale references to navi21|navi3x|navi4x|disableNavi* in active CI paths
• confirmed no remaining references in Jenkins CODEPATH logic

Logic consistency checks:

• verified all matrix CODEPATH values align with renamed buckets
• verified all renamed disable toggles are used by gating functions
• verified CODEPATH-to-attention mapping remains mfma/gfx950 -> mfma, gfx10x/gfx11x/gfx12x -> wmma

Test Result

• Rename applied consistently across Jenkins CODEPATH routing and gating.
• No stale navi* / disableNavi* references remain in active Jenkins CODEPATH logic.
• Expected CI behavior is preserved with only visible CODEPATH naming changed.

CI

• Nightly
• Weekly
• PR

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[Copilot]

Pull request overview

This PR standardizes Jenkins CODEPATH bucket naming in mlir/utils/jenkins/Jenkinsfile by renaming RDNA-family buckets from mixed navi*/gfx* naming to a consistent gfx* convention, while preserving existing CI routing/gating behavior.

Changes:

• Renamed CODEPATH buckets: navi21 -> gfx10x, navi3x -> gfx11x, navi4x -> gfx12x.
• Updated all associated routing logic (node label selection, attention sweep mapping, chip-to-codepath mapping) to use the new bucket names.
• Renamed Jenkins gating toggles from disableNavi* to disableGfx* and updated parameter choices / matrix axes accordingly.

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[dorde-antic]

lgtm

[dorde-antic]

lgtm

[dorde-antic]

Btw we should make sure all ci runs work with this change (todo: kick PR one, nightly, weekly) before merging