Remove codefences from issue titles

[rytilahti]

Proposed change

The issue titles do not support codefencing with backticks, but will instead display them as-is (unwanted behavior shown in the 2nd screenshot at #126349 (comment)).
This PR removes the backticks from all issue titles, but leaves fix_flow titles untouched (see notify/strings.py lines lines 71 and 82) as I'm not sure if they are handled similarly.

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)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

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

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• The code change is tested and works locally.
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[frenck]

Nice! Thanks, @rytilahti 👍

../Frenck