Support for dynamic dashboard layout

[Alan Zhang (alanbzhang)]

🤖 PR Validation — ️✔️ All clear

Breaking Changes
️✔️ None

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Hi Alan Zhang (@alanbzhang),
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in pyproject.toml (or setup.py, if the extension has not migrated yet) as well.

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Pull request overview

This PR adds first-class support in the amg extension for Grafana “dynamic dashboards” (dashboard.grafana.app v2 schema) by routing v2 dashboards through the dashboard apiserver instead of the legacy /api/dashboards/* endpoints, and updating related workflows (backup/restore/migrate/sync) plus tests accordingly.

Changes:

• Introduces dashboard_v2.py helpers for v2 detection, discovery, CRUD, and datasource/library-panel handling.
• Updates core commands (create/import/show/backup/restore/migrate/sync) to preserve and operate on v2 dashboards without lossy down-conversion.
• Expands scenario and unit tests to cover v2 dashboard behavior; bumps extension version to 3.1.0 with HISTORY entry.

Reviewed changes

Copilot reviewed 13 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/amg/setup.py	Bumps extension version to 3.1.0.
src/amg/HISTORY.rst	Adds 3.1.0 release notes entry for dynamic dashboards support.
src/amg/azext_amg/tests/latest/test_definitions.py	Adds a v2 dashboard fixture used by scenario tests.
src/amg/azext_amg/tests/latest/test_amg_scenario.py	Fixes list assertions and adds an E2E v2 dashboard scenario.
src/amg/azext_amg/tests/latest/test_amg_migrate_scenario.py	Fixes list assertions to scope by resource group.
src/amg/azext_amg/tests/latest/test_amg_dashboard_v2.py	Adds unit tests for v2 detection/version resolution/read/write helpers.
src/amg/azext_amg/sync.py	Adds v2-aware sync behavior (folder/title handling, provisioned detection, datasource/library panel remapping).
src/amg/azext_amg/restore.py	Adds v2-aware restore path via dashboard apiserver and v2 datasource remapping.
src/amg/azext_amg/migrate.py	Adds v2-aware migrate behavior (identity/folder/library-panel handling).
src/amg/azext_amg/dashboard_v2.py	New module implementing v2 apiserver discovery, v2 reads/creates, and v2-specific helpers.
src/amg/azext_amg/custom.py	Routes v2 create/import/show through the apiserver; adjusts role assignment principal_id handling.
src/amg/azext_amg/backup.py	Uses a unified dashboard identity helper for both classic and v2 dashboards.
src/amg/azext_amg/backup_core.py	Stores true v2 dashboard resources in backups when applicable (resolving v2 version once per backup).

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[Yong Zhang (yonzhan)]

amg