Merge topic 'link-flags-runcmake'

3ea9d225f7 Tests: Port LinkFlags test to RunCMake
e41256b568 Tests: Move LinkFlags static tests to RunCMake.LinkStatic
d38c268f4d Tests/LinkStatic: Standardize RunCMake use where possible
48e08cb757 Tests/RunCMake: Fix typos in README.rst
12089b576c Tests/RunCMake: Prefer `RunCMake_TEST_EXPECT_*` if set

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !11615