Enable toggleOffOn feature for spotless

[strangelookingnerd]

I ran into some cases where the formatting of com.diffplug.spotless:spotless-maven-plugin simply did not produce satisfying results.
There is a feature that allows comments to toggle spotless formatting on and off (disabled by default):

  public void doNotFormatThisPlease() {
    // spotless:off
   ...
    // spotless:on
  }

While I can override the config in my plugin pom.xml I don't see a reason to not enable the feature by default here.

Testing done

Manually verified that changes have no impact if the feature is not being used.

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[jglick]

The affected code involved switch statements. I think the real issue is that #1120 pulled in what I consider a regression: diffplug/spotless#2447 (comment)

(We could hard-code a version of the formatter in this POM, but then we would need to find a way to keep it up to date.)

[timja]

The affected code involved switch statements. I think the real issue is that #1120 pulled in what I consider a regression: diffplug/spotless#2447 (comment)

I have vague memories of us hitting this before (specifically the per language different default versions)

(We could hard-code a version of the formatter in this POM, but then we would need to find a way to keep it up to date.)

I'm sure renovate can handle it