Removing remove directive

[clarus]

In many packages there are the directives:

remove: ["rm" "-R" "%{lib}%/coq/user-contrib/Semantics"]
flags: light-uninstall

However, with opam 2, these are not necessary any more. In many PR reviews it was advised to remove them. Is there a policy about these directives? Should we remove all of them?

I would be in favor of:

• advising not to use these directives;
• making a huge PR to clean all the existing remove / light-uninstall instances at once.

[palmskog]

I'm definitely in favor of advising people not to use them. However, for the "huge PR", I would defer to @gares if that's advisable with CI. Maybe CI could be circumvented for the PR?

[palmskog]

Another aspect of this removal that should be mentioned: a lot of knowledge about logical paths will be lost. Ideally, one would process and remove:

remove: ["rm" "-R" "%{lib}%/coq/user-contrib/Semantics"]

and at the same time add logpath:Semantics in tags (if not already present).

[gares]

Indeed it would be nice to turn these remove instructions into a logpath metadata. It is a good idea. I'm afraid I did not advise package authors to do that, but we should.

Wrt the pr, I'm ok with it if it turns the fields into a logpath metadata. But beware il will be a lot of work, while it will naturally happen if we are strict with pr reviews. Maybe we should just improve the linting check.