ci: write xml code coverage for better coveralls support

[palazzem]

Related Issues

n/a

Proposed Changes:

Use xml exporter to align coveralls coverage with reality.

Testing:

Check coveralls build.

Extra Notes (optional):

n/a

Checklist

• [x] Related issues and proposed changes are filled
• [ ] Tests are defining the correct and expected behavior
• [ ] Code is well-documented via docstrings

[coveralls]

Pull Request Test Coverage Report for Build 6586329260

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 23 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+8.2%) to 87.348%

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Files with Coverage Reduction	New Missed Lines	%
custom_components/econnect_metronet/init.py	1	48.94%
custom_components/econnect_metronet/alarm_control_panel.py	2	72.5%
custom_components/econnect_metronet/config_flow.py	20	63.51%
<!--	Total:	23		-->

Totals
Change from base Build 6585361986:	8.2%
Covered Lines:	432
Relevant Lines:	498

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💛 - Coveralls