fix(datasource/docker): remove default group commit message topic

[setchy]

Changes

remove default group commit message topic configuration to avoid unexpected Docker tags commit suffixes depending on grouping configuration

Context

• fixes All non-major group now containing Docker tags suffix #17366

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[viceice]

same needs to be done for helm datasource, please also do some real test agains a reproduction to verify behavior

[setchy]

I was going to do helm in a different PR @viceice ;)

Testing with a 'real' repository now

[setchy]

Before

PR - https://github.com/setchy/renovate-minor-group-name/pull/1

After

PR - https://github.com/setchy/renovate-minor-group-name-fixed/pull/1

[renovate-release]

🎉 This PR is included in version 32.174.1 🎉

The release is available on:

• GitHub release
• 32.174.1

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