feat(FR-2451): add Prometheus Query Preset edit modal with live preview

[agatha197]

Resolves #6357 (FR-2451)

Stacked on top of #7086

Summary

• Extracted PrometheusPresetPreview from AutoScalingRuleEditorModal.tsx into a new shared PrometheusPresetPreview.tsx module. This is a pure move — zero behavior change in AutoScalingRuleEditorModal. The Relay query (PrometheusPresetPreviewResultQuery) now lives in the new file.
• Edit mutation wired in PrometheusQueryPresetEditorModal: calls adminModifyPrometheusQueryPreset with a diff-only input (only changed fields are sent; label arrays correctly distinguish "user cleared to []" from "unchanged/omitted").
• Live preview rendered in edit mode under the QueryTemplate field using <PrometheusPresetPreview presetGlobalId={preset.id} />. Preview is edit-only (no ID available in create mode).
• Edit button (EditOutlined) added to the left of the Delete button in the PrometheusQueryPresetList action column.
• AutoScalingRulePresetTab wires editingPreset state and passes the fragment ref into <PrometheusQueryPresetEditorModal presetFrgmt={editingPreset} />.
• i18n: added prometheusQueryPreset.SuccessfullyUpdated to en.json.

Verification

=== Relay ===
--- Relay: PASS ---

=== Lint ===
--- Lint: PASS ---

=== Format ===
--- Format: PASS ---

=== TypeScript ===
--- TypeScript: PASS ---

=== ALL PASS ===

[agatha197]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• test(FR-2451): add E2E tests for prometheus preset CRUD, filter, sort, and table settings #7108 : 2 dependent PRs (#7109 , #7110 )
• feat(FR-2451): polish preset list — BAINameActionCell, copyable QueryTemplate, column settings, i18n #7095
• feat(FR-2451): add Prometheus Query Preset edit modal with live preview #7094 👈 (View in Graphite)
• feat(FR-2451): add Prometheus Query Preset delete confirmation #7086
• feat(FR-2451): add Prometheus Query Preset create modal #7085
• feat(FR-2451): implement Prometheus Query Preset list table #7084
• feat(FR-2451): add prometheus tab scaffolding to AdminServingPage #7082
• main

---

How to use the Graphite Merge Queue

Add either label to this PR to merge it via the merge queue:

• flow:merge-queue - adds this PR to the back of the merge queue
• flow:hotfix - for urgent changes, fast-track this PR to the front of the merge queue

You must have a Graphite account in order to use the merge queue. Sign up using this link.

An organization admin has required the Graphite Merge Queue in this repository.

Please do not merge from GitHub as this will restart CI on PRs being processed by the merge queue.

This stack of pull requests is managed by Graphite. Learn more about stacking.

[github-actions]

Coverage report for ./packages/backend.ai-ui

St.❔	Category	Percentage	Covered / Total
🟢	Statements	81.87%	429/524
🟡	Branches	70.43%	362/514
🟡	Functions	76.86%	93/121
🟢	Lines	83.19%	391/470

Test suite run success

319 tests passing in 13 suites.

Report generated by 🧪jest coverage report action from 1e12616

[github-actions]

Coverage report for ./react

St.❔	Category	Percentage	Covered / Total
🔴	Statements	8.97% (-0.01% 🔻)	1859/20733
🔴	Branches	8.12% (-0.02% 🔻)	1187/14625
🔴	Functions	5.29% (+0.02% 🔼)	297/5617
🔴	Lines	8.7% (-0.01% 🔻)	1750/20114

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🔴	... / PrometheusPresetPreview.tsx	0%	0%	0%	0%

Test suite run success

865 tests passing in 40 suites.

Report generated by 🧪jest coverage report action from 1e12616