Fix tests

[roznawsk]

Description

• add python 3.14
• swap localtunnel for instatunnel
• make the tests run sequentially for each python version
• make the tests not fail if a single python version tests fail
• make sure that we only listen for notifications for the given room
• cleanup room after each test

Motivation and Context

Why is this change required? What problem does it solve? If it fixes an open
issue, please link to the issue here.

Documentation impact

• Documentation update required
• Documentation updated in another PR
• No documentation update required

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)

[Copilot]

Pull request overview

This PR updates CI and the test suite to improve reliability across multiple Python versions by standardizing test fixtures, filtering WebSocket notifications to the room under test, and serializing the test matrix execution.

Changes:

• Add Python 3.14 to the CI matrix, serialize matrix execution, and switch tunnel provider from localtunnel to instatunnel.
• Introduce a shared room_api pytest fixture that tracks created rooms and cleans them up after each test.
• Update notifier tests/utilities to only consume server notifications for the room created within the test.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/test_room_api.py	Switches to the shared room_api fixture.
tests/test_notifier.py	Passes a room id future into event assertions so notifications are filtered to the active test room.
tests/support/asyncio_utils.py	Adds room-scoped filtering/pending buffering to the notification assertion helper.
tests/conftest.py	Adds a tracking FishjamClient fixture and post-test room cleanup.
.github/workflows/ci.yml	Expands Python matrix, serializes test runs, and swaps localtunnel for instatunnel.

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