Rename resources so javax and jakarta can live in same classpath

**Is your feature request related to a problem? Please describe.**
After the Jakartification, mailcap and mime.types still have the same name. This can make problems in classpaths where exists both activations: javax and jakarta.

**Describe the solution you'd like**
Jakarta should have its own resource files: jakarta.mailcap and jakarta.mime.types

**Additional context**
We are doing this in mail too:
https://github.com/eclipse-ee4j/angus-mail/issues/151

Locate the existing mailcap and mime.types resources and the code or tests that reference them. Rename the Jakarta resources to jakarta.mailcap and jakarta.mime.types, then verify that the Jakarta names can coexist with javax activation resources on the same classpath.

Written by the indexing model from the issue text.