Please ship org.gradle.toolingapi source jar in p2 repo

[akurtakov]

It would make debugging easeir for debuging buildship e.g. when used by jdt.ls.
Hopefully it would even help automating IPlab requests like https://gitlab.eclipse.org/eclipsefdn/emo-team/iplab/-/issues/11675 (failng with no source found).

[rgrunber]

@akurtakov is another license review required? I've been getting :

[INFO] License information could not be automatically verified for the following content:
[INFO] 
[INFO] p2/orbit/p2.eclipse.plugin/org.gradle.toolingapi/8.9.0.v20241104-0945-s
[INFO] 
[INFO] This content is either not correctly mapped by the system, or requires review.

for a long time now.

[akurtakov]

Everytime I am in doubt I open iplab issues, so just do it.

[rgrunber]

https://gitlab.eclipse.org/eclipsefdn/emo-team/iplab/-/issues/17435 .