clean installation directory instead of hard removing it in various easyblocks

[smoors]

depends on:

• try to empty install dir if removing it fails easybuild-framework#4932

[boegel]

I won't merge this as is at this point, since we're too close to the EasyBuild v5.1.2, and this hasn't seen any testing yet.

@smoors Maybe we should pull this apart into smaller PRs which are easier to test & get merged?

[smoors]

@smoors Maybe we should pull this apart into smaller PRs which are easier to test & get merged?

done in:

• use clean_dir instead of remove_dir on installation directory for Tarball easyblock #3926
• use clean_dir instead of remove_dir on installation directory for Binary easyblock #3927
• use clean_dir instead of remove_dir on installation directory for Java easyblock #3928
• use clean_dir instead of remove_dir on installation directory for Tkinter easyblock #3929
• use clean_dir instead of remove_dir on installation directory for Molpro easyblock #3930
• use clean_dir instead of remove_dir on installation directory for Go easyblock #3931
• use clean_dir instead of remove_dir on installation directory for GATE easyblock #3932
• use clean_dir instead of remove_dir on installation directory for FDTD_Solutions easyblock #3933
• use clean_dir instead of remove_dir on installation directory for Anaconda easyblock #3934
• use clean_dir instead of remove_dir on installation directory for Amber easyblock #3935