[PWGEM] New Dielectron analysis type: Bootstrapping for v2.

[omassen]

Introducing a new analysis type for performing poisson bootstrapping for the dielectron v2 analysis. This includes:

• changes to the EventHistorgams.h to introduce new histograms per bootstrapping sample and a method of filling them
• Small change to PairUtils.h to be able to choose the new analysis type.
• In Dilepton.h implementing the new analysis. Existing code could for the main part remain untouched. The only change to the existing code is the introduction of a new argument for the FillPairInfo function, needed to parse the bootstrap weights.

[omassen]

Working on resolving new merge conflicts due to PR #15385

[github-actions]

O2 linter results: ❌ 136 errors, ⚠️ 250 warnings, 🔕 0 disabled

[dsekihat]

Hi Olaf, It looks good from my side.

[omassen]

Merge conflicts have been resolved, should be good to go now.

[dsekihat]

It is not required by the system, it would be nicer if you can solve the test build build/O2Physics/o2/macOS.

[omassen]

I have done some checks but the issues with this test build were already there for the previous PR #15385. I have tried to take a look but to me it is not clear how to solve this. I am also not able to replicate these issues locally, as I have MacOS-arm.

[vkucera]

I have done some checks but the issues with this test build were already there for the previous PR #15385. I have tried to take a look but to me it is not clear how to solve this. I am also not able to replicate these issues locally, as I have MacOS-arm.

It's reported by O2 linter, Clang-Tidy, and Clangd. It doesn't matter what OS you have.

[vkucera]

I have done some checks but the issues with this test build were already there for the previous PR #15385. I have tried to take a look but to me it is not clear how to solve this. I am also not able to replicate these issues locally, as I have MacOS-arm.

It's reported by O2 linter, Clang-Tidy, and Clangd. It doesn't matter what OS you have.

Sorry, I misunderstood what the comment was referring to.