Fix gradle change detection for config tasks

[jack-berg]

With the existing setup, you get build flakes when switching between branches where the opentelemetry-configuration version has changes because the tasks aren't properly setup for gradle change detection.

• Move the downloaded zip to tmp/ so it's outside unzipConfigurationSchema's output directory (configuration/)
• Encode the version in the zip filename so that a configurationTag bump produces a new path, triggering a fresh download despite overwrite(false); overwrite(false) is retained to
  avoid redundant network requests on repeat builds (the de.undercouch plugin always reports itself as not up-to-date)
• Switch unzipConfigurationSchema from Copy to Sync so stale files from old schema versions are removed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.29%. Comparing base (839f235) to head (c534422).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8181   +/-   ##
=========================================
  Coverage     90.29%   90.29%           
  Complexity     7650     7650           
=========================================
  Files           843      843           
  Lines         23059    23059           
  Branches       2309     2309           
=========================================
  Hits          20822    20822           
  Misses         1519     1519           
  Partials        718      718           

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