deCONZ - Use proper mechanisms for options flow tests

[Kane610]

Generic clean up

Breaking change

Proposed change

Following @MartinHjelmare comment in #31842

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

• No score or internal
• 🥈 Silver
• 🥇 Gold
• 🏆 Platinum

[codecov]

Codecov Report

Merging #31965 into dev will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev   #31965      +/-   ##
==========================================
+ Coverage   94.65%   94.69%   +0.03%     
==========================================
  Files         763      766       +3     
  Lines       55164    55544     +380     
==========================================
+ Hits        52218    52596     +378     
- Misses       2946     2948       +2

Impacted Files	Coverage Δ
homeassistant/components/demo/config_flow.py	62.85% <0%> (-37.15%)	⬇️
homeassistant/util/logging.py	95.83% <0%> (-1.61%)	⬇️
homeassistant/helpers/entity.py	97.27% <0%> (-0.35%)	⬇️
homeassistant/components/mqtt/cover.py	97.11% <0%> (-0.02%)	⬇️
homeassistant/components/deconz/gateway.py	100% <0%> (ø)	⬆️
homeassistant/components/deconz/binary_sensor.py	98.03% <0%> (ø)	⬆️
homeassistant/components/deconz/climate.py	100% <0%> (ø)	⬆️
...omeassistant/components/soundtouch/media_player.py	100% <0%> (ø)	⬆️
...ssistant/components/google_assistant/smart_home.py	91.2% <0%> (ø)	⬆️
homeassistant/helpers/entity_registry.py	99.53% <0%> (ø)	⬆️
... and 30 more

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