ctags: load ctags files from $builddir
@chergert
Submitted by Christian Hergert Link to original bug (#778217)
Description
If we are building out of tree, the ctags miner will not locate the tags file because it expects they are in $srcdir.
The IdeCtagsService needs to monitor for changes in IdeBuildManager::pipeline and both flush invalid indexes as well as load new indexes based on updated result for ide_build_pipeline_get_builddir().