Fix bang olufsen flaky tests in Python 3.14.3

[epenet]

Proposed change

Spotted in https://github.com/home-assistant/core/actions/runs/25005822536/job/73229778093?pr=162263

Follow-up to #168885 and needed for #162263

The test is flaky because media-player (which updates the friendly name of the device entry) might be initialised before OR after the other platforms.
This ensures that the "updated" friendly name matches the "initial" friendly name.

Type of change

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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @mj23000, mind taking a look at this pull request as it has been labeled with an integration (bang_olufsen) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

This PR stabilizes the Bang & Olufsen integration tests under Python 3.14.3 by ensuring the mocked get_beolink_self() response matches the specific device/config entry used in each test, preventing name/device-info drift during setup and diagnostics collection.

Changes:

• Update Bang & Olufsen tests to explicitly mock MozartClient.get_beolink_self() for non-default devices (e.g., A5, Premiere).
• Extend test imports to include the correct friendly name/JID constants for those devices.
• Refresh diagnostics snapshot expectations to align with the now-deterministic device/entity friendly names.

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
tests/components/bang_olufsen/test_sensor.py	Sets get_beolink_self() mock for A5 battery sensor test to match the A5 config entry identity.
tests/components/bang_olufsen/test_event.py	Sets get_beolink_self() mock for Premiere/A5 event-entity creation tests to avoid name mismatches.
tests/components/bang_olufsen/test_diagnostics.py	Sets get_beolink_self() mock for A5 diagnostics test and updates imported constants accordingly.
tests/components/bang_olufsen/test_binary_sensor.py	Sets get_beolink_self() mock for A5 charging binary sensor test to stabilize naming.
tests/components/bang_olufsen/snapshots/test_diagnostics.ambr	Updates snapshot friendly names/device info to reflect the corrected mocked self identity.

[jbouwh]

LGTM,
Thanks @epenet 👍