Stop configuring report merge tasks while configuring Detekt tasks

[3flex]

See point 2: https://docs.gradle.org/8.0.1/userguide/task_configuration_avoidance.html#sec:task_configuration_avoidance_general

Only mutate the current task inside a configuration action... Mutating anything other than the current task can cause indeterminate behavior in your build.

Also see: #5772 (comment).

Docs should be updated to align - that can be done in a new commit once these changes are reviewed & approved.

[codecov]

Codecov Report

Merging #5813 (ece4374) into main (2290ec8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #5813   +/-   ##
=========================================
  Coverage     84.61%   84.61%           
  Complexity     3787     3787           
=========================================
  Files           546      546           
  Lines         12918    12918           
  Branches       2268     2268           
=========================================
  Hits          10930    10930           
  Misses          862      862           
  Partials       1126     1126           

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[TWiStErRob]

LGTM, tested as well, behaviors were as expected. Please update docs, and reply to conversations.

[picklebento]

TIL

Did you catch this bug manually or there are new warnings from Gradle 8?

[github-actions]

	Warnings
⚠️	This PR is approved with no milestone set. If merged, it won't appear in the Detekt release notes.

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[3flex]

Did you catch this bug manually or there are new warnings from Gradle 8?

It was caught after #5772 was merged - I don't think it's related to Gradle 8. That warning from the Gradle docs that I referenced has been there for some time, I just haven't had a closer look until I made the change in #5772, not realising that the tasks had to be eagerly configured with the current way of configuring report merging.