keep PMT waveforms in stage and add fcl to drop them later

[gputnam]

Copy of #835 for develop branch.

[cerati]

approving as this mirrors PR #835 which is approved

[leoaliaga]

trigger build larsoft@v10_06_00 LArSoft/lar*@LARSOFT_SUITE_v10_06_00 SBNSoftware/sbnalg@v10_06_00_01 SBNSoftware/sbncode@v10_06_00_01

[FNALbuild]

✔️ CI build for LArSoft Succeeded on slf7 for c14:prof -- details available through the CI dashboard

[FNALbuild]

✔️ CI build for LArSoft Succeeded on slf7 for e26:prof -- details available through the CI dashboard

[FNALbuild]

❌ CI build for ICARUS Failed at phase build ICARUS on slf7 for c14:prof -- details available through the CI dashboard

🚨 For more details about the failed phase, check the build ICARUS phase logs

parent CI build details are available through the CI dashboard

[FNALbuild]

❌ CI build for ICARUS Failed at phase ci_tests ICARUS on slf7 for e26:prof -- details available through the CI dashboard

🚨 For more details about the failed phase, check the ci_tests ICARUS phase logs

parent CI build details are available through the CI dashboard