RUMM-3398 Improve output of gradle plugin upload

[xgouchet]

What does this PR do?

Ensure the message about upload "success" is always visible when running the upload task

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

Merging #173 (3e3b7f9) into develop (df43aad) will not change coverage.
The diff coverage is 77.78%.

@@            Coverage Diff             @@
##             develop     #173   +/-   ##
==========================================
  Coverage      86.63%   86.63%           
  Complexity       177      177           
==========================================
  Files             21       21           
  Lines            576      576           
  Branches          72       72           
==========================================
  Hits             499      499           
  Misses            49       49           
  Partials          28       28           

Impacted Files	Coverage Δ
...m/datadog/gradle/plugin/internal/OkHttpUploader.kt	84.03% <66.67%> (ø)
...com/datadog/gradle/plugin/DdAndroidGradlePlugin.kt	74.36% <100.00%> (ø)
...in/com/datadog/gradle/plugin/DdCheckSdkDepsTask.kt	88.89% <100.00%> (ø)
.../datadog/gradle/plugin/internal/DdAppIdentifier.kt	100.00% <100.00%> (ø)