use TrackCollection instead of a view of tracks in muon track isolation (same as #12594 )

[slava77]

use TrackCollection instead of a view of tracks in muon track isolation
the view in the end was never really used

this workaround reduces memory consumption of the muon reco code in HI events.

[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10008/console

[cmsbuild]

A new Pull Request was created by @slava77 (Slava Krutelyov) for CMSSW_8_0_X.

It involves the following packages:

RecoMuon/MuonIsolation

@cmsbuild, @cvuosalo, @davidlange6, @slava77 can you please review it and eventually sign? Thanks.
@battibass, @abbiendi, @jhgoh, @bellan, @trocino, @bachtis, @rociovilar this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

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[cmsbuild]

+1
Tested at: b82670f
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12596/10008/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12596/10008/summary.html

[slava77]

+1

for #12596 b82670f

• technical change in reading tracks from the event; added in 75X already
• jenkins tests pass and comparisons with baseline show no difference

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_0_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1