CMake: Name QT_NO_MAKE_*/BUILD_* variables consistently

For consistency, apply the following renamings:
QT_NO_MAKE_EXAMPLES -> QT_BUILD_EXAMPLES_BY_DEFAULT
QT_NO_MAKE_TESTS    -> QT_BUILD_TESTS_BY_DEFAULT
QT_NO_MAKE_TOOLS    -> QT_BUILD_TOOLS_BY_DEFAULT
BUILD_EXAMPLES      -> QT_BUILD_EXAMPLES
BUILD_TESTING       -> QT_BUILD_TESTS

This should help to better convey the difference between "BUILD" and
"NO_MAKE".

To configure tests, but not to build them by default, pass the
following to CMake:
-DQT_BUILD_TESTS=ON -DQT_BUILD_TESTS_BY_DEFAULT=OFF

Analoguous for examples:
-DQT_BUILD_EXAMPLES=ON -DQT_BUILD_EXAMPLES_BY_DEFAULT=OFF

Tools can be excluded from the default build with:
-DBUILD_TOOLS_BY_DEFAULT=OFF

The variable BUILD_TESTING is still available and initialized with the
value of QT_BUILD_TESTS.

Pick-to: 6.0 6.0.0
Change-Id: Ie5f29dfbdca8bfa8d687981dfe8c19c0397ca080
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

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