Disable native image PrintAnalysisCallTree by default, change semantics to 'enabledReports=true'

[johnaohara]

…cs to 'enabledReports=true'

Reduces heap allocation and increase build speed of a default native image build

[johnaohara]

This PR resolves #2241 but also retains current behaviour, i.e. if users currently define <disableReports>true</disableReports> report generation will be disabled

[gsmet]

Added a small question.

[Sanne]

could we avoid the double negation? I almost misunderstood the option :)

I'd have <enableReports> an have it default to false.

[johnaohara]

@Sanne That is what I have changed it to. Previously to enable report generation, configuration was defined as;

<diableReports>false</disableReports>

whereas now, reports are not generated by default and report generation is enabled with;

<enableReports>true</enableReports>

I have retained the <disabledReports> configuration option to ensure existing builds that set that option do not fail

[gsmet]

Thanks @johnaohara !