dbeaver/pro#4476 Create folders via context menus

[sergeyteleshev]

Closes dbeaver/pro#4476

Summary

• allow creating connection folders from project, folder, and connection context menus
• expose existing folder creation in Resource Manager project, folder, and script context menus
• add icons to the New Folder and New Connection context menu actions

Testing

• yarn workspace @cloudbeaver/plugin-connections build
• yarn workspace @cloudbeaver/plugin-navigation-tree-rm build
• git diff --check origin/devel...HEAD

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity

Metric	Results
Complexity	0

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[Copilot]

Copilot review overview

🟢 Approval recommended

The focused menu and presentation changes are consistent with existing selection, permission, and action-handler behavior.

Review effort: Balanced
Findings: None

What changed in this PR

Adds folder creation to relevant navigation-tree context menus and improves action visibility with icons.

Changes:

• Enables connection-folder creation from connection nodes.
• Exposes Resource Manager folder creation in Create submenus.
• Adds icons to folder and connection creation actions.

File	Description
ResourceFoldersBootstrap.ts	Adds New Folder to Resource Manager context menus.
ConnectionFoldersBootstrap.ts	Allows folder creation from connection context menus.
ACTION_TREE_CREATE_FOLDER.ts	Adds the folder action icon.
ACTION_TREE_CREATE_CONNECTION.ts	Adds the connection action icon.

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