Hide duplicate 'Insert from cloud' action in text editor toolbar

[AlexAndBear]

Description

This pull request removes the duplicate standalone Insert from cloud button from the text editor toolbar.

The cloud image action remains available where it belongs:

• in the Insert image dropdown
• in slash commands

This is done by setting showInToolbar: false on image-cloud.

Related Issue

• Fixes N/A (no dedicated issue was provided)

How Has This Been Tested?

• test environment: local development environment (macOS)
• test case 1: pnpm test:unit --run packages/web-pkg/tests/unit/editor/composables/useEditorActions.spec.ts packages/web-pkg/tests/unit/editor/strategies/html.spec.ts packages/web-pkg/tests/unit/editor/strategies/markdown.spec.ts packages/web-pkg/tests/unit/editor/strategies/tiptapJson.spec.ts
• test case 2: all targeted editor tests pass (4 files, 176 tests)

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)

[JammingBen]

Hehe good catch