Migrate to std::filesystem

[camolezi]

PR description:

Boost and std filesystem have similar functionality. When possible we should use std::filesystem to avoid unnecessary dependencies.

PR validation:

Passed on basic runTheMatrix test.

if this PR is a backport please specify the original PR and why you need to backport that PR:

@vgvassilev @davidlange6

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-30825/17164

• This PR adds an extra 20KB to repository

[cmsbuild]

A new Pull Request was created by @camolezi (Lucas Camolezi) for master.

It involves the following packages:

DataFormats/OnlineMetaData
IORawData/CaloPatterns
L1TriggerConfig/L1GtConfigProducers

@perrotta, @benkrikler, @emeschi, @slava77, @christopheralanwest, @tocheng, @cmsbuild, @rekovic, @mommsen, @tlampen, @jpata, @pohsun can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @mmusich, @rovere, @tocheng this is something you requested to watch as well.
@silviodonato, @dpiparo you are the release manager for this.

cms-bot commands are listed here

[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

• CMSSW_11_2_X_2020-07-18-1100/slc7_amd64_gcc820: https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/8104/console Started: 2020/07/18 23:00

[cmsbuild]

+1
Tested at: bee8aa9
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-a951fd/8104/summary.html
CMSSW: CMSSW_11_2_X_2020-07-18-1100
SCRAM_ARCH: slc7_amd64_gcc820

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-a951fd/8104/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 34
• DQMHistoTests: Total histograms compared: 2525996
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2525948
• DQMHistoTests: Total skipped: 47
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 33 files compared)
• Checked 144 log files, 17 edm output root files, 34 DQM output files

[mommsen]

+1

[jpata]

+1

• tests pass with no differences in reco, as expected
• changes are technical and in line with the description

[pohsun]

+1

[silviodonato]

merge
@rekovic technical fix

[rekovic]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). This pull request will be automatically merged.