remove qtqa and qtrepotools

[ericLemanissier]

they are not part of qt per-se, but tools used when developing qt

Specify library name and version: qt/5.15.2

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• I've followed the PEP8 style guides for Python code in the recipes.
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• I've tried at least one configuration locally with the
  conan-center hook activated.

[conan-center-bot]

Some configurations of 'qt/5.15.2' failed in build 1 (ac5b5eb84429324f8bed3c5c06b754db31f9a8c7):

• Windows x86_64, Release, Visual Studio 14, MT. Options: qt:shared-False
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• Windows x86_64, Release, Visual Studio 15, MT. Options: qt:shared-False
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• Windows x86_64, Release, Visual Studio 16, MT. Options: qt:shared-False
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• Windows x86_64, Release, Visual Studio 14, MD. Options: qt:shared-False
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[conan-center-bot]

Some configurations of 'qt/5.15.2' failed in build 3 (ac5b5eb84429324f8bed3c5c06b754db31f9a8c7):

• Windows x86_64, Debug, Visual Studio 14, MDd. Options: qt:shared-True
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[conan-center-bot]

All green in build 4 (ac5b5eb84429324f8bed3c5c06b754db31f9a8c7)! 😊

• qt/5.15.2: Generated 106 packages. All logs here