fix(sidepanel): close panel on indent click (#DS-4053)

[artembelik]

we can close the panel even if it is specified disableClose

[github-actions]

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[Copilot]

Pull Request Overview

This PR fixes a bug where clicking on the sidepanel indent (background area) would close the panel even when disableClose was set to true. The fix ensures that indent clicks respect the disableClose configuration by routing through the proper close mechanism instead of calling exit() directly.

Key Changes:

• Added an observable stream for indent click events that respects the sidepanel's close behavior
• Modified the indent click handler to emit events through this stream rather than directly calling exit()
• Updated tests to verify both scenarios: closing when allowed and staying open when disableClose is true

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tools/public_api_guard/components/sidepanel.api.md	Added public API exports for the new indent click observable functionality
packages/components/sidepanel/sidepanel.spec.ts	Added test cases to verify indent click behavior with and without disableClose
packages/components/sidepanel/sidepanel-ref.ts	Updated close subscription to include indent click events alongside ESC key events
packages/components/sidepanel/sidepanel-container.component.ts	Implemented indent click observable with Subject and public method
packages/components/sidepanel/sidepanel-container.component.html	Changed indent click handler from direct exit() call to emit through Subject

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