[FEATURE] Allow embedded consumers to hide panel header actions

[abelyakin]

This adds an optional panelOptions.actions configuration for Panels so embedders can hide specific header controls (e.g., description, links, notices, query inspector, fullscreen, plugin actions) while preserving the default behavior when no config is provided. The render structure and layout remain unchanged; this is a pure visibility toggle to support embedded views and custom workflows without breaking existing dashboards.

Screenshots

Checklist

• [x ] Pull request has a descriptive title and context useful to a reviewer.
• [x ] Pull request title follows the [<catalog_entry>] <commit message> naming convention using one of the
  following catalog_entry values: FEATURE, ENHANCEMENT, BUGFIX, BREAKINGCHANGE, DOC,IGNORE.
• All commits have DCO signoffs.

UI Changes

• Changes that impact the UI include screenshots and/or screencasts of the relevant changes.
• Code follows the UI guidelines.
• E2E tests are stable and unlikely to be flaky.
  See e2e docs for more details. Common issues include:
  • Is the data inconsistent? You need to mock API requests.
  • Does the time change? You need to use consistent time values or mock time utilities.
  • Does it have loading states? You need to wait for loading to complete.

[jgbernalp]

Suggested change

	actions?: PanelActionConfig;
	actionsConfig?: PanelActionConfig;