[PWGCF] Adding V0-V0 pair task

[gmantzar]

• Included the V0V0 pair task
• updated the ClosePairRejection task to support V0-V0 pairs

[github-actions]

O2 linter results: ❌ 222 errors, ⚠️ 0 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/o2 for ba1fed4 at 2025-08-18 13:27:

No log files found

Full log here.

[alibuild]

Error while checking build/O2Physics/o2 for cd974ea at 2025-08-18 17:30:

## sw/BUILD/O2Physics-latest/log
CMake Error at cmake/O2PhysicsAddWorkflow.cmake:35 (message):

Full log here.

[alibuild]

Error while checking build/O2Physics/o2 for 711f049 at 2025-08-18 20:37:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/12614-slc9_x86-64/0/PWGCF/FemtoDream/Tasks/femtoDreamPairTaskV0V0.cxx:222:26: error: unused parameter 'context' [-Werror=unused-parameter]
ninja: build stopped: subcommand failed.

Full log here.

[lauraser]

Dear @gmantzar and @victor-gonzalez,

this PR deleted two tasks in the CMakeLists.txt, which are actively used and are developed by other people. One of them is now being re-included by @wrzesaCERN. The other one is from @AntonRiedel for efficiency. This is completely unacceptable and should never have happened as these tasks are already used in hyperloop; all new tags don't have them anymore. Moreover, it is likely that after re-implementation, multiple configurations in Hyperloop will be lost.

Please ensure that such incidents do not happen again in the future. Especially be careful if you do PRs on behalf of your students.

[victor-gonzalez]

Dear @gmantzar and @victor-gonzalez,

this PR deleted two tasks in the CMakeLists.txt, which are actively used and are developed by other people. One of them is now being re-included by @wrzesaCERN. The other one is from @AntonRiedel for efficiency. This is completely unacceptable and should never have happened as these tasks are already used in hyperloop; all new tags don't have them anymore. Moreover, it is likely that after re-implementation, multiple configurations in Hyperloop will be lost.

Please ensure that such incidents do not happen again in the future, as they are completely unacceptable. Especially be careful if you do PRs on behalf of your students.

@lauraser I accept my part on this and completely agree with you, but you and Anton were also asked about reviewing it. When I saw your silence and Georgios query I didn't doubt

[lauraser]

@victor-gonzalez yes, I totally agree with you! I, unfortunately, had a problem with my GitHub emails that I did not notice before. I have fixed the issue today and I should get properly notified about all PRs now.